Name__________KEY____________________

VS 117: Oculomotor Functions and Neurology

Spring 2000

(4 points) List two physical changes of the intraocular lens that would decrease its power.

Reduction of the refractive index gradient

Decrease of surface curvature

(4 points) List the agonist and antagonist that cause the intraocular lens to increase in power.

Agonist = ciliary body

Antagonist= Bruchís membrane

(4 points) What is the lens paradox?

Reduction of lens power as the lens increases in size and curvature with age

(2 points) Which component of accommodation causes empty field myopia?

Tonic

(4 points) List two optical factors that increase the depth of focus.

Reduced pupil size

Increased spherical aberration

(4 points) List three possible odd-error signals that cue the direction or sign of blur (plus vs minus).

Astigmatism, chromatic aberration, hunting cycle

Compute the age that the amplitude of accommodation is 8.5D.

Age/3= 18.5-amp

Age/3= 10

Age= 30 years