Name__________KEY____________________

VS 117: Oculomotor Functions and Neurology

Spring 2000

(3 points) If you could only make pursuit eye movements, list 3 examples of visual activities that you could not perform.

i. reading

ii. image stabilization while walking

iii. shifting attention and foveating new targets

( 4 points) Define Optometer

A device that measures the optical power of the eye

( 4 points) State Heringís Law

Movements of the two eyes are equal and symmetrical. Equal innervation of yoked muscle pairs. "...one and the same impulse of will directs both eyes simultaneously as one can direct a pair of horses with single reins.

( 4 points) What 2 types of eye movements require a visual stimulus?

OKN and Pursuits

( 4 points) Define Primary eye position.

The position of the eye from which either a purely horizontal or purely vertical movement produces no torsion. Sometimes defined less rigorously as gaze parallel to mid-sagittal plane and perpendicular to binocular baseline.

 

 

(4 points) A an uncorrected 2D myopic observer sets the stigma at a scale reading of 7.5 cm from a 10D Badal lens while viewing a target at a 40cm viewing distance? What is the magnitude of the accommodative response?

CF= 10- .075*100 = 2.5D

AR= 2.5-(2) = 0.5D