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The 20-20-20 rule is designed to reduce the effects of long durations of near work on the eyes. When working at a close distance, the eyes must work to focus and maintain a single, clear image. The effort it takes to focus at near work becomes greater the longer the near task is performed.

Convergence is the ability to cross or turn the eyes inward. Convergence insufficiency is a binocular vision condition that occurs when the eyes cannot turn inward to focus on a near target while keeping the target clear and single. This can cause issues with near tasks such as reading or writing as well as lead to headaches and fatigue by the end of the day. Treatment options include vision therapy, prism glasses, and special reading glasses.

Ocular hypertension is a condition in which the eye pressure is higher than usual. Increased eye pressure is also a sign of glaucoma, but ocular hypertension is notably different.

If you have ever been to the eye doctor, you have undoubtedly noticed the many pieces of equipment and various tools, instruments, and devices that are used. Each of these pieces of equipment serve an important role in performing a comprehensive eye examination. Below are some of the most common instruments used by eye doctors in an eye examination.

A corneal ulcer is a bacterial infection in the front of the eye. An ulcer can form in the center or periphery of the cornea depending on where there is damage to the eye. A corneal ulcer will be treated with urgency to attempt to prevent scarring and further infection in the eye.

If you have a pair of glasses and do not know what the prescription in the lenses is, there are a few simple ways to determine whether the glasses are for farsightedness, nearsightedness, or astigmatism. While these methods will not determine the exact prescription in the glasses, it can give you an idea as to the power in glasses.

As people age, cataracts may form and impact vision to the point of needing surgery to remove them. A common concern is whether the cataract will simply come back after the surgery. Fortunately, there is no way for the cataract to return, but vision may be slightly blurry following the surgery still.

Eye allergies or allergic conjunctivitis can cause red, itchy, and watery eyes. These symptoms can be very bothersome and may be worse seasonally. The best treatment for eye allergies will depend on the cause and type of the allergy.

Many people want to be proactive in their health and use vitamins to supplement a healthy diet for the best overall health. There are several vitamins which can be beneficial for your eye health.

Sometimes wearing contact lenses is not comfortable for people, this is called contact lens intolerance. Contact lens intolerance can cause people to wear contact lenses less than they would like to, to stop wearing contact lenses, or to wear contact lenses and have irritation or pain.