Name____KEY__________________________

QUIZ # 1
VS 117: Oculomotor Functions and Neurology

Spring 2001

1. (4 points) Compute the expected age that the Amplitude of accommodation will be 8D.

8= 18.5 - age/3 age= 10.5 X 3= 31.5 years

2. (4 points) Compute the prism diopter stimulus to convergence for a target at a distance of 20cm for a person with a 5.5cm inter-pupillary distance.

5MA X 5.5= 27.5 PD

3. (5 points) List the 4 Maddox components to accommodation and indicate which one is most responsible for large gaze shifts from one target distance to another.
Tonic, Proximal, Optical reflex and Convergence Accommodation (cross-link)

Proximal plays the greatest role

4. (5 points) List 5 ways that human eyes can clear or focus the retinal image .

reduce pupil
squint eye lids to flatten cornea
change lens power
change axial length in growth
change isoindical surface gradient

5. ( 4 points) define isoindical surfaces

Layers of the lens that have a constant index of refraction.