Name______________________________
QUIZ # 2
VS 117: Oculomotor Functions and Neurology
Spring 1998

1. (5 points) List 5 different examples of how various vertebrates vary the optical power of their eyes.
Flatten Corneal curvature
vary proximity between lens and cornea
variable axial length dynamically
ramp retina
physiological bifocal (multiple pupils and elliptical lens)
pinch front lens surface
flatten (stretch) front lens surface

2. (3 points) What three points are attachments for the suspensory ligaments of the lens.
Lens capsule
ciliary processes
bruchs membrane-choroid

3. ( 4 points) What is the predicted amplitude of accommodation of a 33 year old?
18.5-11=7.5D

4. ( 4 points) Compute the image distance for an object located 10 cm in front of an +8 D lens placed in the spectacle plane (simple optometer) (use the Gaussian equation).

1/O + 1/I= 1/F 1/I= 8-10 = -2D 1/2D= 50 cm

5. ( 4 points) Compute the image distance from the spectacle plane for an object located 10 cm in front of an 8 D Badal optometer lens.

CFD= P - P2*Om = 8- 64*0.1m= 1.6D 1/1.6D= 62.5 cm