Vision

Vision Articles

The facts about glaucoma

Glaucoma is an eye disease which involves damage to the optic nerve, sometimes resulting in permanent vision loss. It is one of the leading causes of blindness in adults over age 60. Most of often glaucoma is associated with pressure build up inside the eye. Normally, a fluid called the aqueous humor flows around the eye. It's made up mostly of water, plus a small amount of nutrients to nourish the cornea and lens. After bathing the eye, this fluid drains through an area called the trabecular meshwork in the corner where the cornea and iris meet. More »

LASIK Surgery: What to expect

LASIK is an acronym for laser-assisted in-situ keratomileusis—a type of laser eye surgery that permanently reshapes the cornea to correct refractive errors. Normally, the cornea—the clear layer in the front of the eye—focuses light directly on the retina in the back of the eye. When the cornea is irregularly shaped, light doesn't focus precisely on the retina, which results in these refractive errors: More »

Retinal Vessel Occlusion

The retina is the light-sensitive layer at the back of the eye that is responsible for vision. Blood circulation to most of the retina's surface is primarily through one artery and one vein. If either blood vessel or one of their smaller branches is blocked, blood circulation to the retina can be significantly disrupted. The blockage is called an occlusion. If a main vessel becomes occluded, the eye typically loses vision, often suddenly. If blockage occurs in a smaller branch vessel, there may be partial vision loss or no symptoms. The condition is often painless. Retinal Artery OcclusionThe retinal artery carries oxygen-rich blood to the retina. When a blockage occurs in the retina's main artery, or in one of its small branches, the retina's light-sensitive cells gradually begin to suffocate from lack of oxygen. Unless normal circulation to the retina can be restored promptly, these cells will die within a few minutes or hours depending on how completely the blood flow is obstructed. This can cause permanent and often substantial loss of vision. (Locked) More »

Common physical problems that threaten your driving skills

There are many physical changes that can affect driving skills. For example, arthritis pain may make it hard to grip a steering wheel, get in and out of a car, or push the pedals; hearing loss can make it harder to detect hazards, such as an ambulance approaching an intersection. Driving assessment programs can help people find out if their conditions are impairing their road skills. The goal of such programs is to keep people in the driver’s seat, so that they can stay safe, mobile, and independent for as long as possible. (Locked) More »

Focus on easier reading

At some point, almost all people need reading glasses as their eyes naturally lose the ability to focus up close, a condition called presbyopia. People also may get extra reading assistance by using desk magnifiers, lubricating the eyes with artificial tears, and installing proper lighting. More »

Drooping Eyelid (Ptosis)

A drooping eyelid is also called ptosis or blepharoptosis. In this condition, the border of the upper eyelid falls to a lower position than normal. In severe cases, the drooping eyelid can cover all or part of the pupil and interfere with vision. Ptosis can affect one or both eyes. It may be present at birth (congenital ptosis), or it may develop gradually over decades. Sometimes ptosis is an isolated problem that changes a person's appearance without affecting vision or health. In other cases, however, it can be a warning sign that a more serious condition is affecting the muscles, nerves, brain or eye socket. Ptosis that develops over a period of days or hours is more likely to signify a serious medical problem. Some of the causes of ptosis include: (Locked) More »

Pinkeye (Conjunctivitis)

  Conjunctivitis, also called pinkeye, is an inflammation of the conjunctiva, the transparent membrane that lines the eyelids and covers the whites of the eyes. Conjunctivitis can be triggered by allergies, by contact with irritating chemicals, or by infections with either a virus or bacteria.   (Locked) More »

Presbyopia

As we age, the lens of the eye becomes increasingly inflexible, making it harder to focus clearly on near objects. This is called presbyopia. No one knows exactly what causes the lens to become inflexible, but it happens to everyone as a natural part of aging. In order for us to see images clearly, light rays enter the eye, where the lens bends and focuses the rays on the retina. The lens changes shape to allow the eye to focus on objects at different distances. Beginning early in life — perhaps as early as age 10 — our lenses gradually stiffen and begin to lose the ability to change shape. By the time we are in our 40s, the lens has trouble focusing up close, and we begin to experience blurred vision when we try to do tasks that require up-close focus, such as reading or needlework. The lens continues to stiffen until about age 65, when nearly all its flexibility has been lost. (Locked) More »

Snellen Test for Visual Acuity

A Snellen test uses a chart with different sizes of letters or forms to evaluate your visual acuity-that is, the sharpness of your vision. The test shows how accurately you can see from a distance. No preparation is necessary. You stand or sit at a specific distance from the eye chart. Usually you are told to cover one eye with a cardboard piece or with your hand while you read letters with the other eye and say them out loud for the doctor. (Locked) More »