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Medical texts have referred to the eye patch as a "pirate's patch" and, writing in the Minnesota Academy of Sciences Journal in 1934, Charles Sheard of the Mayo foundation pointed out that by "wearing a patch (The pirate's patch) over one eye, it will keep the covered eye in a state of readiness and adaptation for night vision". [20]
Cotton wool spots are commonly caused by changes to the retina secondary to diabetes, hypertension, or blockages to blood vessels to the retina, such as central retinal vein occlusion. [ 5 ] [ 8 ] While at one point believed to have been the result of nerve damage in the retina, interruptions to axoplasmic flow to these nerves may result from ...
Photopsia can present as retinal detachment when examined by an optometrist or ophthalmologist. However, it can also be a sign of uveal melanoma. This condition is extremely rare (affecting 5–7 per 1 million people, typically fair-skinned, blue-eyed northern Europeans). Photopsia should be investigated immediately.
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Associated with retinal detachments; Secondary to severe chemical burns of the eye; Associated with essential iris atrophy; Toxic glaucoma; Neovascular glaucoma, an uncommon type of glaucoma, is difficult or nearly impossible to treat, and is often caused by proliferative diabetic retinopathy (PDR) or central retinal vein occlusion (CRVO).
A 1-megaton explosion can cause flash blindness at distances as great as 13 miles (21 km) on a clear day, or 53 miles (85 km) on a clear night. If the intensity is great enough, a permanent retinal burn (photic retinopathy) will result." [7]
The Worth Four Light Test is relatively simple to undertake. First you must place the red/green goggles over the patients eyes, with the red goggle traditionally placed over the right eye. Red Green Goggles used in the Worth Four Light Test. Next you must dim the room lighting. This allows the patient to see the lights better.
Diabetic retinopathy (also known as diabetic eye disease) is a medical condition in which damage occurs to the retina due to diabetes.It is a leading cause of blindness in developed countries and one of the lead causes of sight loss in the world, even though there are many new therapies and improved treatments for helping people live with diabetes.