The LASIK Blog - Optics and Refraction

Visual Field Test

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:06:17 -0400

The visual field is the entire area one can see. It includes central and peripheral (side) vision. A visual field test can detect problems with vision in any part of the visual field. Changes in the visual field may be difficult to notice since both eyes are generally used at the same time. One eye can sometimes compensate for some vision loss in the other. A problem may not be detected until each eye is tested separately.

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Tinted Contacts

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:05:31 -0400

Many types of tinted contact lenses are available. They can enhance and even change the color of ones eyes for cosmetic purposes, for costumes, or provide special effects for the movie industry.

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Sunglasses

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:04:45 -0400

Sunglasses are popular for comfort and fashion, but now there is medical evidence supporting the use of sunglasses to protect the long-term health of the eyes.

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Strabismus

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:03:52 -0400

Strabismus refers to misaligned eyes. If the eyes turn inward (crossed), it is called esotropia. If the eyes turn outward (wall-eyed), it is called exotropia. Or, one eye can be higher than the other which is called hypertropia (for the higher eye) or hypotropia (for the lower eye). Strabismus can be subtle or obvious, intermittent (occurring occasionally), or constant. It can affect one eye only or shift between the eyes.

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Refractive Errors

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:02:43 -0400

To see clearly, light rays must be bent or refracted to focus on the retina, the light- sensitive nerve layer that lines the back of the eye. The cornea and lens of the eye work together to bend or refract light rays and bring them together on the retina. If a refractive error is present, the light is not focused directly on the retina, so images appear blurry.

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Myopic Degeneration

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:01:41 -0400

Myopic degeneration is an uncommon condition characterized by progressive stretching of the eye that damages the retina, the layer of light-sensitive cells that lines the back of the eye. People with severe nearsightedness (high myopia) are at greater risk for myopic degeneration.

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Low Vision

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 09:00:44 -0400

Over three million people in the United States do not have normal vision even with corrective lenses. If ordinary eyeglasses do not provide clear vision, one is said to have low vision. This should not be confused with blindness. People with low vision still have useful vision that can often be improved with low-vision devices.

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How to Care for Contact Lenses

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:58:43 -0400

The key to avoiding the irritation and infection sometimes associated with contact lens wear is proper cleaning.

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Giant Papillary Conjunctivitis (GPC)

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:56:39 -0400

Giant papillary conjunctivitis (GPC) is an inflammation of the inner surface of the eyelids, most frequently associated with contact lens wear. It can develop in people who wear either soft or rigid gas permeable contact lenses and can occur at any time, even if an individual has successfully worn contacts for a number of years. Although not vision threatening, GPC can be inconvenient and may require one to stop wearing contacts temporarily or even permanently.

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Eyeglasses for Infants and Children

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:55:31 -0400

Prescriptions for glasses can be measured in even the youngest and most uncooperative children by using a special instrument called a retinoscope to analyze light reflected through the pupil from the back of the eye.

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Eyeglasses

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:54:21 -0400

Sixty percent of the 161 million Americans who wear prescription eyewear choose eyeglasses. Wearing eyeglasses is one of the simplest ways to correct vision problems.

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Extended-Wear Contact Lenses

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:53:06 -0400

Some people do not consider wearing contact lenses because they think the required cleaning, disinfecting, storing, and inserting are too much trouble. They may also want the option of occasionally napping or sleeping with their contacts in their eyes.

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Contacts and Cosmetics

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:51:29 -0400

Contact lens wearers who wear cosmetics on a daily basis may be especially vulnerable to eye problems. Misuse of products and adverse reactions to ingredients used in cosmetic formulas cause lens deposits, eye irritation, allergy, dryness, injury and infection. Knowing which products to use and how to use them is important for long-term, problem-free contact lens wear.

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Contact Lenses

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:50:47 -0400

Over 24 million people choose contact lenses to correct vision. When used with care and proper supervision, contacts are a safe and effective alternative to eyeglasses. And with todays new lens technology, many people who wear eyeglasses can also successfully wear contacts.

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Color Vision

farzady@globallaservision.com (Global Laser Vision) — Tue, 19 Sep 2006 08:49:16 -0400

Color blindness (color vision deficiency) is a condition in which certain colors cannot be detected. There are two types of color vision difficulties: inherited (congenital) problems that you have at birth, and problems that develop later in life.
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