Abo Study 1 Flashcards
(28 cards)
A trifocals power is what percentage of the add
50%
On a script if there is a value under the cylinder portion it means the patient has
Astigmatism
The axis on a script coincides with. A. Sphere or b. cylinder
Sphere
When a person can see an object at 20feet that a normally sighted person can also see at 20feet they have
20/20 vision
Chart used to measure visual acuity is the
Snellen chart
If a person can see an object at twenty feet that a normally sighted person can see at forty feet they have
20/40 vision
A concave lens will refocus light on the retina for a myopic or hyperoptic eye
Myopic
A convex lens will focus light rays on the retina for a myopic or hyperoptic eye
Hyperoptic
-3.50 -1.00 x 180 is an example of what type of astigmatism
Compound myopic
.50 -1.00 x 180 is what type of astigmatism
Mixed
+2.50 -1.00 x 180 is an example of what type of astigmatism
Compound hyperoptic
How many inches does a meter equal
39.37
How many millimeters in 3 meters
3000
Convert 8millimeters to meters
.008 meters
Convert 3 centimeters to millimeters
30
How many centimeters in 6 millimeters
.6
The speed of of light in air is
186,000 miles per second
When the speed of light is deviated in the course of passing from one transparent to another it is known as
Refraction
What theory describes light as traveling through space in minute bursts of energy
Corpuscular
The focal length of a +1.00 diopter lens is
.05 diopters
If a converging lens has a focal length of +2 meters, it’s power is
+.50 diopters
Visible light is part of the overall spectrum of radiant energy. Although the range of wavelengths of which are perceived as visible light can vary with the individual, it is generally understood to lie between
390 to 750 nanometers
If a prism can displace an image one centimeter at a distance of one meter, it is said to have a power of
1 prism diopter
The distance between the crests of two waves is called
Wavelength
