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A (Aberration to Automated Lamellar Keratoplasty)

Aberration

Monday, January 11th, 2010

Distorted or blurred image.

Ablation

Monday, January 11th, 2010

Removal by surgery. To ablate means to remove by surgery.

Accommodation

Monday, January 11th, 2010

The ability of the crystalline lens to alter its focus from distance to near or from near to distance.

Achromatopsia

Tuesday, January 12th, 2010

No colour vision/congenital.

After image

Tuesday, January 12th, 2010

The sensation of a visual image no longer in view for example a light source.

Age-related Macular Degeneration (AMD)

Tuesday, January 12th, 2010

Degeneration in the macular or central retina of the photorececptors resulting in the loss of central vision effecting both reading and distance.

Aids

Tuesday, January 12th, 2010

Most at risk when T-cell count falls below 250.Symptoms to look for :- flashing spots or ’spiderwebs’ blurred vision flashing lights and blind spots.Other disorders include detached retina lid tumours shingles red eye or a spot on the white.

Allergies

Tuesday, January 12th, 2010

Triggered by the body’s immune system as protection. Causes :- Pollen soaps foods fabrics cosmetics etc.Symptoms :- Watering light sensitivity pain swellings.

Amblyopia

Tuesday, January 12th, 2010

Lazy eye. Reduced vision in one or both eyes with no visible signs of abnormalities or disease.

Aneurysm

Tuesday, January 12th, 2010

Weakness of the artery wall. Retinal aneurysms can be caused by diabetes.

Angioma

Tuesday, January 12th, 2010

Benign tumour. Can cause retinal blood leakage and detachment.

Aniridia

Tuesday, January 12th, 2010

No iris/congenital. Results in the inability to control the light entering the eye. Requires a contact lens with an artificial iris.

Anisometropia

Wednesday, January 13th, 2010

A measurable difference in the power of each eye. Usually only a problem when 3 or more dioptres of difference.

Aphakic

Wednesday, January 13th, 2010

No crystalline lens.

Astigmatism

Wednesday, January 13th, 2010

Unequal curvature of the cornea. Remains relatively constant.

Automated Lamellar Keratoplasty (ALK)

Tuesday, January 12th, 2010

Refractive surgery where an insrument known as a microkeratome lifts a corneal flap and sculpts the remaining corneal tissue.Has gradually been replaced by lasik.