Refraction test
Email this page to a friend Eye test - refraction; Vision test - refraction; Refraction
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The refraction test is an eye exam that measures a person's prescription for eyeglasses or contact lenses.
How the Test is Performed
This test is performed by an ophthalmologist or optometrist. Both of these professionals are often called "eye doctor."
You
sit in a chair that has a special device (called a phoroptor or
refractor) attached to it. You look...
11:53 PM
Corneal transplant or Keratoplasty; Penetrating keratoplasty
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The
cornea is the clear outer lens on the front of the eye. A corneal
transplant is surgery to replace the cornea with tissue from a donor. It
is one of the most common transplants done.
Description
You
will probably be awake during the transplant, but you will be given...
11:46 PM
Eye muscle repair
Email this page to a friend Repair of cross-eye; Resection and recession; Strabismus repair; Extraocular muscle surgery
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Eye
muscle repair is surgery to correct eye muscle problems that cause
crossed (misaligned) eyes. The medical term for crossed eyes is strabismus.
Description
The goal of this surgery is to allow the eye muscles to be...
11:45 PM
Extraocular muscle function testing
EOM; Extraocular movement; Ocular motility examination
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Extraocular
muscle function testing is an examination of the function of the eye
muscles. A doctor observes the movement of the eyes in six specific
directions.
How the Test is Performed
You
are asked to sit or stand with your head...
11:39 PM
what is Hyphema ?
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Hyphema is blood in the front area of the eye.
Causes
Hyphema is usually caused by trauma to the eye. Other causes of bleeding in the front chamber of the eye include:
Blood vessel abnormality
Cancer of the eye
Severe inflammation of the iris
Symptoms
Bleeding in the front portion of the eye
Eye pain
Light...
11:36 PM
Eye: foreign object in or Removing a particle in the eye
The eye will often clear itself of tiny objects, like eyelashes and sand, through blinking and tearing. Do not rub the eye. Wash your hands before examining it.Examine the eye in a well-lighted area. To find the object, look up and down, then from side to side.If you can't find the object, grasp the lower eyelid and gently pull down on it to look under the lower eyelid. To look under the...
11:31 PM
Eye Diseases and problems
Some eye problems are minor and fleeting. But some lead to a permanent loss of vision. Common eye problems include
Cataracts - clouded lenses
Glaucoma - damage to the optic nerve from too much
pressure in the eye
Retinal disorders - problems with the nerve layer at
the back of the eye
Conjunctivitis - an infection also known as pinkeye
Your best defense is to have regular checkups,...
11:30 PM
Eye Cancer info
Cancer of the eye is uncommon. It
can affect the outer parts of the eye, such as the eyelid, which are
made up of muscles, skin and nerves. If the cancer starts inside the
eyeball it's called intraocular cancer. The most common intraocular
cancers in adults are melanoma and lymphoma. The most common eye cancer
in children is retinoblastoma, which starts in the cells of the retina.
Cancer can also spread...
11:05 PM
Diabetic Eye Problems or Diabetic retinopathy
Do you know what causes the most blindness in U.S. adults? It is an eye problem caused by diabetes,
called diabetic retinopathy. Your retina is the light-sensitive tissue
at the back of your eye. You need a healthy retina to see clearly.
Diabetic retinopathy happens when diabetes damages the tiny blood
vessels inside your retina. You may not notice at first....
11:05 PM
what is Eye Movement Disorders ?
When you look at an object, you're
using several muscles to move both eyes to focus on it. If you have a
problem with the muscles, the eyes don't work properly.
There are many kinds of eye movement disorders. Two common ones are:
Strabismus - a disorder in which the two eyes don't line up in the same direction. This results in "crossed eyes" or "walleye."
Nystagmus - fast,...
11:02 PM
Eye Wear or Contact lenses, Eyeglasses
Eye wear protects or corrects your
vision. Examples are sunglasses, safety goggles, glasses and contact
lenses. If you need corrective lenses, you may be able to choose
between contacts or glasses. Either usually requires a prescription.
Almost anyone can wear glasses. Contact lenses require more careful
handling.
Many jobs and some sports carry a risk of eye injury.
Thousands...
11:02 PM
Pinkeye or Conjunctivitis
Conjunctivitis is the medical name
for pinkeye. It can cause swelling, itching, burning, discharge and
redness of the protective membrane that lines the eyelids and covers
exposed areas of the white of the eye. Causes include
Bacterial or viral infection
Allergies
Substances that cause irritation
Contact lens products, eye drops, or eye ointments
Pinkeye usually does not affect vision....
10:58 PM
what is Eyelid Disorders ?
Your eyelids help protect your
eyes. When you blink, your eyelids spread moisture over your eyes.
Blinking also helps move dirt or other particles off the surface of the
eye. Closing your eyelids when something is coming towards your eyes can
protect from injuries.
Like most other parts of your body, your eyelids can get infected,
inflamed, or even develop cancer. There are also...
10:58 PM
Refractive Errors or Farsightedness, Hyperopia, Myopia, Nearsightedness
Your cornea is the clear front part of your eye. It is like a window that
controls and focuses the light coming into the eye. If your cornea has an
irregular shape, the light does not focus properly. Everything looks blurry.
This is a refractive error.
Four common refractive errors are
Myopia, or nearsightedness - clear vision close up but blurry...
10:53 PM
Macular Degeneration or Age-related macular degeneration, AMD
Macular degeneration, or age-related macular degeneration (AMD) is a leading cause of
vision loss in Americans 60 and older. It is a disease that destroys your sharp, central
vision. You need central vision to see objects clearly and to do tasks such as reading and
driving.
AMD affects the macula, the part of the eye that allows you to see fine detail. It does
not hurt,...
10:53 PM
Vision Impairment and Blindness or Low vision
Vision impairment, or low vision, means that even with eyeglasses, contact lenses,
medicine or surgery, you don't see well. Vision impairment can range from mild to severe.
The leading causes of vision impairment and blindness in the United States are age-related
eye diseases: macular degeneration, cataract and glaucoma. Other eye disorders, eye injuries and birth defects can also cause...
10:30 AM
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