Remember, all unattended chronic inflammations may cause disfiguring discolorations of your sclera.（慢性炎癥）【1】

You will notice that the sclera in young children is quite white and ‘spotless’. As we age, the sclera gradually becomes yellowish and even brownish. This is the result of years of damage caused by infection, allergy and environmental toxins and degeneration.（感染、過敏、環(huán)境毒素和退化）【1】

Ocular melanocytosis is a congenital condition that manifests as slate-gray or bluish patchiness on the sclera, the white portion of the eye, explains the American Academy of Ophthalmology. Although the condition itself is benign, individuals with it have a higher incidence of glaucoma and are at a higher risk for melanoma. Slate-gray patches caused by scleral melanocytosis are especially common in African-American and Asian children.

（美國眼科學(xué)會解釋說，眼部黑色素細胞增多癥是一種先天性疾病，表現(xiàn)為鞏膜（眼睛的白色部分）上的石板灰色或藍色斑塊。雖然這種疾病本身是良性的，但患有這種疾病的人患青光眼的幾率更高，患黑色素瘤的風(fēng)險也更高。由鞏膜黑素細胞病引起的板灰色斑塊在非裔美國人和亞裔兒童中尤其常見。）【2】

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Set-up for Seeing Your Retina activity, showing position of flashlight, eye and dark screen.

While looking straight ahead, move the light slowly from side to side a short distance, about 0.5 cm in each direction. Do not follow the motion of the light with your eye—keep looking straight ahead as you move the light back and forth for 20 seconds.

Notice what appears in your field of vision. It will look like the branches of a tree, or the branching of a river viewed from high above.【3】

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Genetics
Although eye color is generally believed to be hereditary, scientists are beginning to understand that there is a complex, multi-genetic process that really dictates eye color. One aspect of this process is the creation of melanocytes, or the cells which create pigmentation. People who have blue eyes have little to no melanocytes in their iris while people with brown eyes have the largest number of melanocytes. Melanocytes are also responsible for hair and skin color. Just as aging can trigger biological changes to melanocytes in hair, resulting in grey hair, it may also cause changes to melanocytes in the iris, resulting in changes in eye color.

Medication
Eye color changes can sometimes result as a side effect of medication or herbal supplementation. Argyrosis is a condition in which the sclera develops a bluish gray color due to the deposit of silver into the skin tissue and is generally caused by excessive intake of silver salts. Latanoprost, a medication used to treat glaucoma and eye pressure conditions, can increase brown pigmentation in the eye, causing light eyes to become darker 4. Long term use of prednisone may also cause discoloration of the sclera.【4】

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Genetics
Genetics has much to do with whether or not your eyes will change color as you age, and 10 to and 15 percent of Caucasians will experience change in eye color (races with darker eyes generally experience little change as they get older). This occurs because the amount of melanin in the iris will decrease over time, causing the color of the iris to alter. This is the same principle that causes hair to change color as we age, and the rate and age at which is this occurs can vary due to genetic determination.【5】

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What causes grey sclera in child?
Scleral melanocytosis is a common pediatric condition that becomes prominent with increasing age and usually is bilateral. The benign condition is more common in persons of Asian descent. The condition characteristically features black or gray-blue pigmentation in the scleral tissue.
What causes grey sclera?
If they look grayish: It's probably just a result of the natural aging process, which can make the whites of your eyes (formally known as sclerae) become grayer.
What does grey sclera mean?

Answer: A bluish-gray discoloration of the white of the eye could represent many conditions ranging from benign calcification, to an inflammatory lesion, to a tumor. I would suggest this discoloration be evaluated by an ophthalmologist.
Is grey sclera normal?
If the grey spot arises from the sclera or epi-sclera (outermost layer of the sclera), then the conditions are usually congenital (present since birth). These conditions include the eye disease, ocular melanocytosis, or scleral thinning from defective collagen production.
Should newborns eyes be white?
Most white infants are born with bluish-gray eyes, but the pigmentation of the iris (the colored part of the eye) may progressively darken, usually not reaching its permanent color until about 3 to 6 months of age.
Why is my sclera dull?
Eyes that are dull, lacklustre, or losing their sparkle are often caused by today's busy and demanding lifestyles. Lack of sleep, long working hours, spending too much time staring at computer and mobile device screens and late nights can all have an impact – but in some instances it could also be health-related.
Do gray eyes change color?
The intensity of gray eyes depends on the individual. People with gray eyes may also note that their eyes seem to change color depending on the color of clothing (or eye makeup) the individual is wearing, or how bright the surrounding lighting is.
What color do slate GREY eyes turn?
When light hits the iris at birth, it starts producing melanin and the more melanin the genes in your baby are programmed to produce, the darker the eye color becomes from what may be a nice blue or slate-gray at birth and in turn become green or hazel, and then turn brown or black.
When do babies eyes turn color?
Permanent eye color is not set until a baby is at least 9 months old, so wait until your child's first birthday to determine what color they will be. Even then, sometimes you may find little surprises. Subtle color changes can still occur all the way up until about 3 years of age.
When do newborns eyes turn color?
A newborn's eyes can change color in the six to eight months after birth. Eye color is determined by the amount of melanin present in the iris of the eye, which develops as newborn babies grow.
What causes the sclera to change color?
Red sclera are primarily the product of dilated conjunctival blood vessels, and yellow the result of the deposition of scleral lipids in aging and bilirubin in jaundice. Group members use such color cues to quickly access the emotional and health status of an individual.
Is being blind just black?
The majority of people associate complete – or total – blindness with absolute darkness. After all, if you close your eyes you will only see black, so that must be what totally blind people “see.” This is actually a very common misconception reinforced by the media and our own assumptions.

上面信息來自【6】

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Reference：

【1】Color Of Your Sclera Is A Cue For Your Health, Attractiveness And Age - Eye Bulletin

【2】What Does It Mean When There Are Grey Spots on the Whites of Eyes??

【3】?Seeing Your Retina

【4】Eye Discoloration, Yellowing Whites, Around and Under Eye Discoloring
【5】Gray Sclera (white Part Of Eye) Health Remedies - Joyful Belly School of Ayurveda

【6】What causes grey sclera in child?

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎勵來咯，堅持創(chuàng)作打卡瓜分現(xiàn)金大獎

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