COT Flashcards : Refraction, Retinoscopy and Refinement 5%
A “scissors reflex” may occur during retinoscopy and is associated with ____
A. cataracts
B. Fuch’s dystrophy
C. Keratoconus
D. Narrow Angle Glaucoma
C. Keratoconus
Cycloplegic refraction is performed to
A. prevent the accommodative effort required to compensate for hyperopia
B. reveal the acceptability of a particular correction
C. only detect minimal refractive error
D. reveal full correction of hyperopic error
A. prevent the accommodative effort required to compensate for hyperopia
When performing refraction, the Jackson cross cylinder is used to
A. determine the amount of mixed astigmatism
B. refine the cylinder power and axis
C. refine the spherical power
D. determine the endpoint of the refraction.
B. refine the cylinder power and axis
Streak retinoscopy is a(n)
A. retinal exam for diabetic retinopathy
B. subjective method for measuring refractive error
C. test performed by laser
D. objective method for measuring refractive error
D. objective method for measuring refractive error
The astigmatic clock has black lines intersecting at a common point with the end separative by
A. 20-degree or 5-degree intervals
B. 30-degree or 10-degree intervals
C. 40-degree or 15-degree intervals
D. 50-degree or 20-degree intervals
B. 30-degree or 10-degree intervals
The distance from the anterior surface of the eye to the back surface of the spectacle lens is the
A. base curve
B. pupillary distance
C. lens distance
D. vertex distance
D. vertex distance
The condition in which the eye does NOT refract light equally in all directions is
A. emmetropia
B. astigmatism
C. amblyopia
D. esotropia
B. astigmatism
Starting the plano in retinoscopy and using an appropriate working lens at 66 cm, a “with” reflex is MOST commonly observed in which refractive error?
A. Exophoria
B. Astigmatism
C. Myopia
D. Hyperopia
D. Hyperopia
Refractometry without requiring patient response is considered to be
A. preliminary
B. refining
C. objective
D. subjective
C. objective
