Unit 5⃣-Visual Impairment Flashcards
What instrument measures visual fields?
Perimeter
Patients with _____ benefit most from aids that magnify.
Central field loss
To be considered legally blind your best eye must be ___/___ or worse.
20/200
Rigid Contact Lenses are best for treating….
Keratoconus
______ is a condition which creates a premature aging of the blood vessels and causes the retina to hemorrhage.
Diabetic retinopathy
An American made hand magnifier which measures 24D will provide ____ magnification.
6x
_____ is an instrument used to examine the interior of the eye.
Opthalmoscope
Elevated ICP
Glaucoma
_______ is a disease in which the rods of the retina are slowly destroyed and the remainder of the retina atrophies.
Retinitis pigmentosa
In the Snellen chart the notation 20/60, the “60” represents….
The distance at which a patient with “normal” vision could see that size of the letter on the chart.
Motor vehicle VA’s
20/40 at DVM or 20/70 from the DR.
Angiography
A procedure that uses Fluorescein dye to trace blood flow through the retina. Used to reveal retinal hemorrhages.
Scotomas
Blind spots
To estimate required magnification needed, divide the best corrected acuity by the required amount.
Ex. Best corrected 20/200
Required 20/40
200/40=5x magnification.
Labeled magnification is usually equal to the dioptric power divided by 4.
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