Which part of the eye is the white of the eye

Sclera - Wikipedi

The sclera, also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some crucial elastic fiber The white part of the eye, called the sclera, is a protective layer that covers more than 80% of the eyeball's surface. A healthy sclera is white. But what does it mean when the sclera takes on a different hue The sclera is the white part of the eye that surrounds the cornea. In fact, the sclera forms more than 80 percent of the surface area of the eyeball, extending from the cornea all the way to the optic nerve, which exits the back of the eye. Only a small portion of the anterior sclera is visible This is a smooth, white layer on the outside, but the inside is brown and contains grooves that help the tendons of the eye attach properly. The sclera provides structure and safety for the inner workings of the eye, but is also flexible so that the eye can move to seek out objects as necessary By Brian Chou, OD What is a Subconjunctival Hemorrhage? A subconjunctival hemorrhage is a red spot in the eye which occurs when small, delicate blood vessels break beneath the tissue covering the white of the eye (conjunctiva). A subconjunctival hemorrhage usually is benign, causing no vision problems or discomfort despite its appearance

The white part of your eye, known as the sclera, is covered by a thin, clear tissue called the conjunctiva. The conjunctiva also lines the inside of your eyelid, housing a meshwork of small, thin blood vessels. These small blood vessels are fairly fragile and can easily burst or break Limbal dermoids are noncancerous tumors that occur in children's eyes. They're typically white and overlap the white and colored part of the eye. They generally don't cause harm, but can affect a.. The white part of your eye, known as the sclera, is covered by a thin, clear tissue called the conjunctiva. The conjunctiva also lines the inside of your eyelid, housing a meshwork of thin blood vessels. These blood vessels can easily burst or break. When they break, blood leaks out and settles between the conjunctiva and the sclera The blue tint is caused by thin or transparent scleral collagen found within the eye. In osteogenesis imperfecta, the body fails to produce type I collagen, a component that helps form bone, connective tissues, teeth and the white part of the eye or sclera, says the American Academy of Orthopaedic Surgeons According to Chinese/Japanese medical face reading, when the white part of the eye, known as the sclera, is visible beneath the iris, it represents physical imbalance in the body and is claimed to be present in alcoholics, drug addicts and people who over-consume sugar or grain

Why Are the Whites of My Eyes Discolored? - American

Sclera White of the Eye - Definition and Detailed

To make the whites of your eyes look brighter, apply 1-2 eye drops, like Visine or Clear Eyes, in the effected eye to reduce dryness and irritation that can cause redness. Be sure to use these sparingly because they can cause your eyes to become dryer over time Pinguecula spots are white or yellow and consist of fat or protein deposits. They appear on the conjunctiva, which is the transparent covering of the white part of the eyeball. These spots are.. Brown Spots on White Part of Eyes. The white part of your eye is called sclera. Brown spots on eye white can appear more visible and worrisome. The brown spot on white parts of your eyes could be harmless spots such as nevus or freckles of the eyes. Occasionally, a more serious condition such as melanoma might also lead to brown spots on your eyes Your eye is a slightly asymmetrical globe, about an inch in diameter. The front part (what you see in the mirror) includes: Iris: the colored part; Cornea: a clear dome over the iris; Pupil: the. Sclera - also known as the white of your eye, this is the outer layer of the human eye. Vitreous humour - a clear gel that fills the inside of the eye and helps it to retain its shape. Tears. Tears have three main components; a watery component, an oily component and mucus. These create a film which covers the white of the eye and the cornea

is the clear bulging surface in front of the eye. It is the main refractive surface of the eye Pink eye (conjunctivitis) Scleritis (inflammation of the white part of the eye) Sty (a red, painful lump near the edge of your eyelid) Subconjunctival hemorrhage (broken blood vessel in eye) Uveitis (inflammation of the middle layer of the eye) Causes shown here are commonly associated with this symptom Cornea: It is the transparent, anterior or front part of our eye, which covers the pupil and the iris. The main function is to refract the light along with the lens. Iris: It is the pigmented, coloured portion of the eye, visible externally. The main function of the iris is to control the diameter of the pupil according to the light source It is a conjunctival lesion involving only one eye that is usually accompanied by a slate grey colored patch in the skin near the affected eye. Benign Melanosis, also called racial melanosis, typically involves both eyes and looks like patchy areas of increased pigmentation in the white part of the eye. It is common among middle-aged people.

A large, red blood spot may appear on the white of the eye as a result of a broken blood vessel below the conjunctiva, the clear surface of the eyeball, explains Mayo Clinic. It can happen from coughing or sneezing and is called a subconjunctival hemorrhage in the medical community Pinguecula: Probably this is a pinguecula which is a response of the white blood cells of the eye to an allergen such as dust etc. This may or may not progress to Read More. Send thanks to the doctor. 90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more OK, the ophthalmoscope is not a part of the eye... If you want to see into someone's eye you have a problem. Your head will block the light entering the eye. Attributed to Helmholtz, the ophthalmoscope solves this problem by shining a small beam of light in to the eye. The reflected light is then available for viewing Iris: The colored part of the eye that is made up of muscles that control the pupil— contracting the pupil in bright light and expanding the pupil in low light. Sclera: The white part of the eye that surrounds the iris. This structure is made up of fibrous tissue that protects the inner structures of the eye

the white of the eye; composed of tough, white, opaque, fibrous connective tissue part of the retina that lacks photoreceptors. optic disc. modification of the choroid that controls the shape of the crystalline lens and contains the ciliary muscle. ciliary body. drains the acqueous humor from the eye. scleral venous sinus Scleritis is the inflammation of the white of the eye (sclera), a serious and painful condition. The sclera is comprised of tough, fibrous tissues protecting the eye and covering 83 percent of its. The white part of the eyes is called the sclera. It is normally a thick tissue, but if it thins, it becomes translucent and allows the underlying tissue to show through. Several things can cause. Most people's eye color remains constant after the age of 3. Eye discoloration can, however, occur later in life and may be caused by genetics, disease or medication. You should consult an ophthalmologist if you notice changes in the color of your sclera — the white part of your eye — or your iris to rule out medical problems White, outermost layer of the eye. Helps maintain shape and gives attachment to muscles. photoreceptors. The cells in the retina that respond to light (rods and cones) rods. Photoreceptor cells in the eye that detect black, white, and gray. cones

Parts of the Eye & Their Function Robertson Optical and

An eye hemorrhage is a condition where blood vessels inside the eye rupture and bleed, leaving red splotches on the white of the eye, in the retina, or between the retina and the lens. Diabetes, high blood pressure, and eye strain are some factors that can cause eye hemorrhages. Bleeding in the eye is, however, often without an obvious cause. No, we aren't talking about sclera tattooing. A 70-year-old man went to the doctor because the whites of his eyes were turning blue. The man told doctors that he didn't have blurry vision or eye. This is a scratch that happens on the white part of your eye. This white part covers your iris. This white part is called your cornea and it plays an important role in your vision. Your cornea helps to focus the light as it enters your eye. When you have a scratched eye it is also referred to as a corneal abrasion The white part of the eye is actually a fibrous tunic which comprises the 5/6 of the eye's outer coat. It functions to protect the intra-ocular structures and sustain the shape of the eye. Due to its fragile nature in younger children, it may have a bluish color Bleeding: The white part of the eye may look bright red, or you might see small red or black spots in the eye. A red eye can be a sign of an eye injury or several other health conditions. What causes eye injuries? Most eye injuries cause damage to the eyeball or the bones and tissues around the eye

Dr. Weakley says bad photography angles are the most common causes of white-eye reflex in photos. If a child is looking to the side in a photo, the flash will likely illuminate the sides of the eye, which are white. If a child is looking directly into the camera, the flash will illuminate the back of the eye (retina), which is red The thin membrane covering the white part of your eye and the underside of your eyelid—called the conjunctiva—forms a pouch and prevents objects from getting behind your eyeball. If a contact.

Subconjunctival Hemorrhage (Bloody Eye

  1. e your eye and check your vision. You may need tests to check for an underlying medical condition
  2. What can cause yellow spots on the white part of the eye? The two most likely causes of yellow spots are: 1. Pinguecula. Pinguecula is a yellow spot or bump on the conjunctiva (white) of the eye, caused by a deposit of calcium, protein or fat. A pinguecula is small, painless and not dangerous, although it may cause irritation if it does grow.
  3. or injury; Symptoms: Blood in the white part of the eye, sometimes spreading over the entire eye, turning the sclera bright red. No pain, no vision loss, no blood in the iris/pupil area
  4. If the whites of your dog's eyes turn red, get him to the vet as soon as possible, as dog eye color can reveal a lot about his health. Red or bloodshot eyes can result from trauma, infection, allergies, or eye diseases, requiring your vet to diagnose the cause
  5. Eye doctors can often spot the seepage or the new, abnormal blood vessels that sprout up to replace faulty ones. Indeed, diabetes takes a big toll on the eyes in general and can lead to blindness.

Question 11. SURVEY. 30 seconds. Q. This part of the eye is the tough, white out layer of the eye... answer choices. Cornea. Sclera. Choroid Commonly caused by a viral or bacterial infection, conjunctivitis causes the white part of the eye to appear red. It may also make the eye feel itchy or gritty, like there's tiny grains of sand.

When you're looking at somebody, the white part of the eye actually has a clear covering to it, and that can get inflamed. In some cases, pinkeye may result from an allergic reaction A pterygium is a raised, yellowish, wedge-shaped thickening on the white part of the eye, which can occasionally spread over the cornea, obstructing vision. It is painless (although it can cause irritation and dryness). Pterygium occurs as a reaction by the eyes to being exposed to wind, dryness, dust and sunshine (solar radiation) The eye itself looks normal, but it is not being used normally because the brain is favoring the other eye. Conditions leading to amblyopia include strabismus, an imbalance in the positioning of the two eyes; more nearsighted, farsighted, or astigmatic in one eye than the other eye, and rarely other eye conditions such as cataract Inflammation in the back of the eye. Posterior uveitis is inflammation in the layers of the uvea in the back of the eye. This condition can cause the release of inflammatory debris into the vitreous that are seen as floaters. Posterior uveitis may be caused by infection, inflammatory diseases or other causes. Bleeding in the eye

Jun 03, 2021 1:00 PM. Author: Moran Eye Center Those crystal clear, bright white eyes you see models rocking in fashion magazine closeups may look great, but for the most part, they're photoshopped down to the last tiny vein The colored part of the eye. The iris is partly responsible for regulating the amount of light permitted to enter the eye. Lens (also called crystalline lens). The transparent structure inside the eye that focuses light rays onto the retina. Lower eyelid. Skin that covers the lower part of the eyeball, including the cornea, when closed. Macula Sclera: White, hard outer coat of the eye Scler/o/sis: Condition of hardness Scler/o = Sclera Pertaining to the sclera (adj.) Excision of the sclera (or part) Formation of an opening into the sclera Inflammation of the sclera qScler/al qScler/ectomy qScler/o/stomy qScler/itis Ir/o, Irid/o = Iris Colored part of the eye Other causes of white eye. Possible conditions resulting in leukocoria or a white glow in the eye/pupil in a photo include: Light shining off the optic nerve: this is the most common cause of a white reflex or white pupil in a photo.Light entering the eye at a certain angle may be reflected from the optic nerve If there's blood where the eye's usually white, that's one thing to keep in mind. If your eye is painful as you move it around from side to side or up and down, that's another thing that may be a.

by Jackie W. (Boston, MA) Rosie's Eye Now Rosie Rosie Rosie is a 4 year old French bulldog. Yesterday I noticed a black spot in the sclera (white part) of her eye. I mentioned it to my boyfriend and he said he noticed it recently but hadn't always remembered seeing it. I looked back to [ One often-missed but very telling body language cue is the whale eye in dogs. When a dog feels frightened or threatened, his eyes widen, exposing the white parts of his eyes (the sclera). It's. A pinguecula (pin-GWEK-yoo-lah) is a yellowish, slightly raised thickening of the conjunctiva on the white part of the eye (sclera), close to the edge of the cornea. Pingueculae are non-cancerous bumps on the eyeball and typically occur on top of the middle part of the sclera — the part that's between your eyelids and therefore is exposed. The sclera is the white part of the eye, forming an outer layer that protects everything inside, while the choroid is the layer of the eye that lies between the retina and the sclera. It is made up of layers of blood vessels that nourish the back of the eye

sclera [skle´rah] (L.) the tough, white outer coat of the eyeball, covering approximately the posterior five-sixths of its surface, continuous anteriorly with the cornea and posteriorly with the external sheath of the optic nerve. adj., adj scle´ral. The sclera and other eye structures. From Lammon et al., 1995. blue sclera abnormal blueness of the. The eye looks pink or red. Infective conjunctivitis often begins most obviously in one eye but quickly spreads to both eyes. The whites of the eyes look inflamed. The eyes may feel gritty and may water more than usual. Some mild soreness may develop, particularly if you rub the eyes. The eyelids may become swollen Symptoms and Causes of a Broken Blood Vessel on the Front of the Eye. Besides the visible bleeding between the sclera (the white part of the eye) and conjunctiva, many people describe a scratchy or itchy feeling on the surface of the eye. Pain is generally non-existent or minimal, and there is no change in vision, although there may be some. Dry eye is common and not solely a condition of aging. Tears are made up of oil, water, and mucous; all of which need to be in perfect balance to effectively bathe our eyes between blinks. Dry eye can occur with hormone imbalances, contact lens wear, immune system disorders, certain medications, and infrequent blinking

When to Be Concerned About a Bleeding Ey

Emily, It appears as though the third eyelid or nictitating membrane has covered your kittens eyes, probably due to an infection. The white blob could be part of the infection or the third eyelid. You should see a vet Mifflin warns that sometimes discoloration of the white of the eyes can be a sign of a serious medical condition. For example, a yellow tinge could signify liver disease, or a dramatic increase in red might be due to an abnormality of the blood vessels inside the head or neck. Once again, consulting an ophthalmologist is a good place to start eye? The symptoms of an infection inside the eye includesevere eye pain that doesn't go away, a large drop in vision and a severe red eye. (Mild irritation and redness on the white part of the eye are normal after the injection, especially in the first day.) If you have any of these symptoms or if you ar The bright red eye is often dramatic in appearance and can be scary. Usually, it appears as a bright red patch, but on occasion, the entire white part of the eye is covered by the blood. The blood stops short of the corneal limbus (the rim around the clear cornea)

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Name the part of the eye with each of the following functions: a. Change the shape of the lens b. Contains the rods and cones c. Forms the white of the eye d. Form the optic nerve e. Keep dust out of eye f. Change the size of the pupil g. Produce tears h. Absorbs light within the eyeball to prevent glare 1 The eye has three main layers. These layers lie flat against each other and form the eyeball. The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye). The slight bulge in the sclera at the front of the eye is a clear, thin, dome-shaped tissue called the cornea. The middle layer is the choroid The white of the eye, the sclera,which forms part of the supporting wall of the eyeball. The sclera is continuous with the cornea. Furthermore this external covering of the eye is in continuity with the dura of the central nervous system

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Retina -The retina is the area at the back of the eye that receives the refined, visual message from the front of the eye, and it transmits that visual message to the brain using electrical signals. Sclera -The sclera is the white part of the eye, and its main function is to provide strength, structure, and protection for the eye Diagnosed through a comprehensive eye examination, typically while examining the front structures of the eye with a microscope. Based on the appearance of tissue growth from the white part of the eye onto the cornea. Often whitish, flat or raised area of tissue, and bilateral 33 years experience Ophthalmology. Most likely benign: The white part of your eye is called the sclera. The sclera can accumulate pigmentation: blue, grey or brown discoloration due to melanin, a natural Read More. 0. 0 comment. 2. 2 thanks. Send thanks to the doctor

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A person's eye color is actually the color of one's iris, the cornea being transparent and the white sclera entirely outside the area of interest. Adult male with amber-colored eyes: This color is extremely rare and occurs when an unusually stronger presence of the yellow pigment (lipochrome) exists in the iris, with a rather small amount of. Anatomy of the Eye. Sclera. The sclera is outermost layer of the eyeball. It is the white (and opaque) part of the eyeball. Muscles responsible for moving the eyeball are attached to the eyeball at the sclera. Cornea. At the front of the eyeball, the sclera becomes the cornea. The cornea is the transparent dome-shaped part of the eyeball

Humans are the only animals with obviously visible eye whites, with irises that are much more prominent and therefore readable. We can easily tell where someone is looking and often what someone is thinking. But in many animals the whites of the eye, known as the sclera, aren't white at all but are pigmented, making the iris hard to distinguish Conjunctivitis is an inflammation and infection of the sclera, the white part of the eye.It is caused by exposure to chemicals or toxins, allergies, or bacteria. If your optometrist or ophthalmologist is unsure whether you have conjunctivitis or eye herpes, they will use a lab test to make a conclusive diagnosis

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The sclera is the white outer wall of the eye. It covers nearly the entire surface of the eyeball. It is a strong layer made of collagen fibers. The tendons of the six extraocular muscles attach to the sclera. Fig. 2: The cornea is the front clear part of the eye in the center part of the outer wall of the eye. CORNEA The sclera is a membrane of tendon in the eye, also known as the white of the eye. Rugged and robust, the sclera works to protect the inner, more sensitive parts of the eye like the retina and choroid. It is about 0.03 of an inch thick except for where the four straight eye muscles append, where the depth is no more than 0.01 of an inch Like hazel eyes, only about 5% of the world's population has amber-colored eyes. This eye color is a light brownish, sometimes rusty. People of Asian, Spanish, South American, and South African descent are more likely to have amber eyes. Gray - 3% Eyes appear gray because of an increase of collagen, blocking the color to shine through The sclera of the eye is the large white area on the outsides of the iris. It can appear red when blood vessels within the eye dilate giving the so called blood shot appearance. The sclera can turn yellow when the body has high levels of bilirubin in it

An unusual white ring in the front of a woman's eyeball was the result of a rare condition. Above, an image of the patient's eye showing the ring around the edge of the cornea Eye Discharge. Normal Guinea pigs excrete a milky white liquid which lubricates their eyes and is used to help them clean their faces. After the eye fills up with the white fluid, the guinea pig will then take their front paws and make washing motions. This may happen several times per day although you may never even notice Only part of the eye is visible in a person's face. The whole eye — the eyeball — is about the size and shape of a ping-pong ball. All parts of the eye are extremely delicate, so our bodies protect them in several ways. The eyeball sits in the eye socket (also called the orbit) in the skull, where it is surrounded by bone Sclera A tough, white layer that protects the eyeball Cornea A transparent layer at the front of the eye that refracts the light entering to help focus it Conjunctiva Thin, sensitive epithelium layer which lines the surface of the cornea Vitreous Humor Jelly-like substance behind the lens which maintains the shape of the eyebal

The white part of the eye may be red (conjunctival swelling) as well, which could be a sign of elevated intraocular pressure and/or inflammation (for example, traumatic iritis). SLIDESHOW Pink Eye (Conjunctivitis) Symptoms, Causes, Treatments See Slideshow The sclera is commonly known as the white part of the eye. It's basically the shell that holds all the internal structures. It is made of collagen and elastic fibers, and it is covered by a thin membrane called the conjunctiva The eye is a paired organ, the organ of vision. The eye is made up of various components, which enable it to receive light stimuli from the environment, and deliver this stimuli to the brain in the form of an electrical signal. Vision involves all components of the eye. Structure. The eye is contained within the bony orbit of the head Hallmarks of pink eye include: If it's allergy season when pollen and other irritants abound, the body can release histamine as part of an allergic reaction. If this is the case and the eye is.

However, even though the eyes tend to be dry normally, tearing can be significant when the eyes are irritated, such as when an onion is cut or an object contacts the eye. Arcus senilis (a deposit of calcium and cholesterol salts) appears as a gray-white ring at the edge of the cornea Eye doctors can check for corneal conditions as part of a comprehensive eye exam. The exam is simple and painless. Learn what to expect from a comprehensive dilated eye exam. To check for corneal abrasions (scratches), your eye doctor may use a special type of eye drops called fluorescein dye. The dye makes corneal abrasions easier to see The fibrous sclera becomes clear, instead of white. This part of it is called the cornea and covers your pupil and iris. The middle choroid layer becomes the iris and the ciliary body. The iris is the coloured part around your pupil that covers the lens of the eye. It controls how much light enters your eye. The ciliary body lies just behind.

in this video we're going to talk about the structure of the eye and we're going to do that by drawing a cross sectional diagram of the eyeball the first thing we're going to draw is the white part of the eye which is known as the sclera so I'm just drawing that in and I'm labeling sclera and the sclera is a thick fibrous tissue that basically forms the substance of the eyeball so the white. 2 Small, Dry Particles of Eye Mucus. Possible cause: This may be caused by allergic conjunctivitis which affects the eyelid lining and the white part of the eye also known as conjunctiva. This is often caused by mold, dander, pollen and other substances that cause allergies. Allergies often run in the family and it's difficult to know the type of allergy a person has Anatomy of the Eye. Choroid. Layer containing blood vessels that lines the back of the eye and is located between the retina (the inner light-sensitive layer) and the sclera (the outer white eye wall). Ciliary Body. Structure containing muscle and is located behind the iris, which focuses the lens. Cornea

Why Do the Whites of My Eyes Have a Blue Tint

The prosthesis looks somewhat like a giant contact lens. It will match the shade of the sclera (white part of the eye), the iris color, veins, and the shape of your eyes as much as possible. Your prosthesis is custom-made to match your remaining eye exactly. What's involved in taking care of a prosthesis A black eye may show up after 1 or 2 days. A few specks or a small amount of blood on the white part of the eye often appear after a blow to the eye. Use home treatment to help relieve your symptoms. A direct blow to the eye can damage the eyeball, the supporting muscles and ligaments, the eyelid, or the bony eye socket (orbit)

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The swelling of the white part of the eye following rubbing the eyes indicates conjunctival swelling. It is not a serious condition and no need to worry about it. Washing eyes with cold water will relieve this. This requires medical attention if it does not resolve or if there are symptoms like pain, watering, discharge.. Non-Hispanic white (white) beneficiaries had a higher prevalence of receiving an eye exam (55.6%) than did non-Hispanic blacks (blacks) (48.9%) and Hispanics (48.2%). Barriers to receiving eye care (e.g., suboptimal clinical care coordination and referral, low health literacy, and lack of perceived need for care) might limit Medicare. Primary intraocular melanoma usually starts in the middle layer of the eye, called the uvea. This is called uveal melanoma. Melanoma can also start in other places of the eye, like the conjunctiva, which is a thin clear covering over the white part of the eye The lens is located in the middle of the eye and it is normally clear, but sometimes part or all of a lens develops a cloudy, opaque cataract. Cataracts block light from reaching the back of the eye resulting in poor vision or blindness, depending on their severity

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Ocular melanomas, although rare, are the most common eye tumor in dogs. Ocular melanomas can originate from the uvea or the limbus. About 80% of uveal melanomas (and all limbal melanomas) are benign. The rate of metastasis is less than 5%. Ocular melanomas are at least in part heritable and caused by one or more genetic mutations. Uveal melanomas can become discrete, raised pigmented masses. Given experiences along those lines, seeing white women try to make the upturned, slanted eye part of their aesthetic feels like a slap in the face. As critics see it, the fox eye trend is, at best, a played-out attempt to look exotic. At worst, it's an example of cultural appropriation or just straight-up racist The conjunctiva is the mucous membrane covering the inside of the eyelids and white part of the eye. Clinical signs of conjunctivitis include ocular discharge, redness, and swelling of these tissues Even rarer is retinoblastoma, a form of cancer seen in babies that can cause white vitreous floaters that make the pupil look white in photographs (normally it would look red). Summary. In summary, eye floaters are caused by thickened clumps of vitreous jelly Anatomy of the eye. The eye is a very delicate, yet surprisingly durable organ. It consists of several layers. The cornea is a transparent layer that covers the front of the eye. The iris is the colored part of the eye and it is responsible for letting in more or less light. The lens gathers and 'bends' light in order to focus it on the retina

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A sore, inflamed eye is also more likely to become infected, leading to a thick green-yellow discharge and more irritation. This leads to a vicious circle of irritation, rubbing and further damage, with the potential for permanent damage or even loss of the eye. Also, optimal eye health depends on everything being in the right place Bright red area in the white of your eye. burst blood vessel. Gritty or burning feeling, sticky eyes. conjunctivitis. Sore, blurry or watery eyes. dry eyes. Itchy, sore or red eyelids. blepharitis. Feels like there's something in your eye The lens is located in the middle of the eye and is normally clear, but sometimes all or part of the lens develops a cloudy cataract. Cataracts block light from reaching the back of the eye, resulting in poor vision or blindness, depending on their severity. Cataracts are often confused with a normal aging change that affects cat lenses called.