Refractive Errors Worksheet Flashcards
The refractive condition that brings parallel rays of light to focus on the retina when the eye is at rest is called:
a. Ametropia
b. Isometropia
c. Emmetropia
d. Hyperopia
Emmetropia
The refractive condition in which parallel rays of light to focus either in front of or behind the retina when the eye is at rest is called:
a. Ametropia
b. Isometriopia
c. Emmetropia
d. Hyperopia
Ametropia
Which best identifies the visual system?
a. Plus
b. Minus
c. Aspheric
d. Lenticular
Plus
If light rays come to a point focus at one place in front of the retina, what is the refractive error?
a. Astigmatism
b. Presbyopia
c. Hyperopia
d. Myopia
Myopia
If light rays come to a point focus at on place in front of the retina, and another place behind the retina, what is the refractive error?
a. Mixed astigmatism
b. Compound astigmatism
c. Irregular astigmatism
d. Simple astigmatism
Mixed astigmatism
If light rays come o a point focus at one point in front of the retina in one principle meridian, and one point on the retina in the opposite principle meridian, what is the refractive error?
a. Compound myopic astigmatism
b. Simple myopic astigmatism
c. Compound hyperopic astigmatism
d. Simple hyperopic astigmatism
Simple myopic astigmatism
If light rays come to a point focus at one point behind the retina in one principle meridian, and one point on the retina in the opposite principle meridian, what is the refractive error?
a. Compound myopic astigmatism
b. Simple myopic astigmatism
c. Compound hyperopic astigmatism
d. Simple hyperopic astigmatism
Simple hyperopic astigmatism
If light rays come to a point focus at one point behind the retina, what is the refractive error?
a. Astigmatism
b. Presbyopia
c. Hyperopia
d. Myopia
Hyperopia
If light rays come to a point focus at two different points behind the retina in opposite principle meridians, what is the refractive error?
a. Compound myopic astigmatism
b. Simple myopic astigmatism
c. Compound hyperopic astigmatism
d. Simple hyperopic astigmatism
Compound hyperopic astigmatism
If light rays come to a point focus at two different points in front of the retina in opposite principle meridians, what is the refractive error?
a. Compound myopic astigmatism
b. Simple myopic astigmatism
c. Compound hyperopic astigmatism
d. Simple hyperopic astigmatism
Compound myopic astigmatism
If all light rays come to a point focus on the retina, what is the condition?
a. Ametropia
b. Presbyopia
c. Emmetropia
d. Astigmatism
Emmetropia
What is a general term for any error of refraction in the eye?
a. Ametropia
b. Presbyopia
c. Emmetropia
d. Astigmatism
Ametropia
Nearsighted is also referred to as what?
a. Short sight
b. Long sight
c. Boss eyed sight
d. Cross eyed sight
Short Sight
Farsighted is also referred to as what?
a. Short sight
b. Long sight
c. Boss eyed sight
d. Cross eyed sight
Long sight
Myopia is corrected with what type of lens?
a. Concave
b. Convex
c. Meniscus
d. Sphero-cylinder
Concave
Hyperopia is corrected with what type of lens?
a. Concave
b. Convex
c. Meniscus
d. Sphero-cylinder
Convex
The correction for a condition whereby light rays focus on the retina in one principal meridian and in front of the retina in the opposite principle meridian would be illustrated by what Rx?
a. -3.00 -2.00 x 180
b. +3.00 -2.00 x 180
c. Plano -2.00 x 180
d. +3.00 +2.00 x 180
Plano -2.00 x 180
The correction for a condition whereby light rays focus in front of the retina in two places in opposite principle meridians, would be illustrated by which Rx?
a. -3.00 -2.00 x 180
b. +3.00 -2.00 x 180
c. Plano -2.00 x 180
d. +3.00 +2.00 x 180
-3.00 -2.00 x 180
The correction for a condition whereby light rays focus behind the retina in two places in opposite principal meridians, would be illustrated by which Rx?
a. -3.00 -2.00 x 180
b. +3.00 -2.00 x 180
c. Plano -2.00 x 180
d. +3.00 +2.00 x 180
+3.00 +2.00 x 180
The correction for a condition whereby light rays focus in front of the retina in one place and behind the retina in the opposite principle meridians, would be illustrated by which Rx?
a. -3.00 -2.00 x 180
b. +3.00 -2.00 x 180
c. Plano -2.00 x 180
d. +3.00 +2.00 x 180
+3.00 -2.00 x 180
The correction for a condition whereby light rays come to a single point focus in front of the retina would be illustrated by which Rx?
a. -3.00 -2.00 x 180
b. +3.00 +2.00 x 180
c. -3.00 sphere
d. +3.00 sphere
-3.00 sphere
The correction for a condition whereby light rays come to a single point focus behind the retina would be illustrated by which Rx?
a. -3.00 -2.00 x 180
b. +3.00 +2.00 x 180
c. -3.00 sphere
d. +3.00 sphere
+3.00 sphere
Irregular astigmatism is the condition whereby ____. The principle meridians are not at right angles to one another and is better corrected with the use of contacts lenses.
a. The principle meridians are not at right angles to one another and is better corrected with the use of contact lenses.
b. The principle meridians are at right angles to one another and is better corrected with the use of contact lenses.
c. The principle meridians are not at right angles to one another and is not better corrected with the use of contact lenses.
d. The principle meridians are at right angles to one another and is not better corrected with the use of contact lenses.
The principle meridians are not at right angles to one another and is better corrected with the use of contact lenses.
If a 45 year old patient presents with the chief complaint .. “ I see alright to read during the day, but I need more light to read at night,” what may be their condition? (We don’t diagnose, but should be able to identify certain conditions.)
a. Astigmatism
b. Presbyopia
c. Hyperopia
d. Myopia
Presbyopia
