Eyeglasses are used to correct a variety of defects in your vision such as myopia (nearsightedness) and hyperopia (farsightedness.) The optical properties of your lenses are known collectively as your eyeglass prescription. An ophthalmologist or...
Nearsightedness, or myopia is a common vision problem that affects about four out of every 10 people. People who are nearsighted have trouble seeing in the distance. Eyeglasses used to correct nearsightedness are either prescribed to be worn...
According to Refractive Error Source, it is common to have some degree of imperfect vision because light does not focus correctly on most people's retinas. Most vision issues can be corrected with eyeglasses. Every eyeglass prescription has a set...
An optometrist will take several different measurements when prescribing eyeglasses. These numbers, which will appear on the eyeglass prescription, describe what kinds of problem that each eye has. These measurements also provide instructions for...
Lasik improves your vision but it won't make it perfect. Slightly more than half of patients have 20/20 vision. The degree of success you'll have depends on your pre-op level of nearsightedness. If you're extremely nearsighted (8 diopters or...
Contact lens prescriptions must be obtained from an eye care practitioner, either an optometrist or an ophthalmologist. Even if a patient already has a prescription for glasses, additional tests and measurements are required for proper lens fitting.
If you wear contact lenses, you may be curious about some of the codes and numbers imprinted on the lens packaging. Optometrists prescribe contact lenses with different degrees of power to correct various vision problems. The Federal Trade...
The contact lens prescription is essential for the proper vision correction and fit of the lenses. Without the prescription, you cannot, by law, obtain your lenses. You can, however, obtain your prescription from your eye care provider and then...
More than 24 million people in the U.S. wear contact lenses, notes the University of Michigan's Kellogg Eye Center. Contact lens exams are different than examinations for glasses. During a contact exam, the eye is measured and other tests are done...
Swimming goggles are an essential element if you plan to spend time in the water. They not only protect your eyes from chlorine or seawater, they also assist your vision underwater, ensuring that you don't bump into any hazards. This ubiquitous...
Your eye doctor will measure your pupil size in millimeters in both light and dark conditions. He will try to assess whether or not the pupils are significantly different in dilation from one another, a key indicator of anisocoria. Doctors may...
Cataract surgery is a safe procedure; 95 percent of people having cataract surgery have no problems, according to the Harvard Medical School. But as with any surgery, complications can arise. Cataract surgery can cause complications in the retina,...
Cataracts, clouding of the lens inside the eye that focuses images on the retina, are inescapable. According to ophthalmologist Charles Slonim of All About Vision, all people develop cataracts, if they live long enough. However, cataracts usually...
Eyeglass prescriptions must be precise. Correcting vision allows little room for mistakes. The first time you put on a new pair of glasses, you expect your vision to be clearer and sharper than with your previous prescription. If, instead, your...
Any part of the eye can be affected by degenerative changes that decrease vision and interfere with activities of daily living. Some degenerative changes occur because of aging; others are related to heredity factors. Having regular eye exams and...
Scopes are optical devices mounted on firearms to improve visibility, aim and shot efficiency. Rifles, shotguns and even handguns all benefit from scopes, with the enhanced aiming capabilities eliminating potential problems due to focus or target...
The Bushnell Legend Ultra HD 8x42mm binoculars are lightweight and are water- and fog-proof--perfect for birders who like to take treks to find the birds they wish to observe. They also come with a 100 percent money-back guarantee and a range of...
Celestron Regal LX 8x42 binoculars are ideal for use by birders and wilderness lovers. According to Celestron, the Regal LX are part of the company's top-of-the-line premium series of binoculars and offer high-quality performance at a reasonable...
Contact lenses are worn on the surface of the eye. The Ohio State University Medical Center says that contacts correct vision problems by using magnification in the lens to add or subtract power, also referred to as strength. Power is the amount...
The reason most people in the past with a severe astigmatism could not wear contacts is the shape of their cornea. The cornea of someone who has an astigmatism is shaped more like a football, or oval shaped, whereas the cornea of an eye without...
