Stenopaic Slit

Question 1

Describe the stenopanic slit? When is it used during an exam?

Answer 1

Refractive procedure of last resort

Refracts one meridian at a time

Reduced pupil diameter in the meridian perpendicular to the slit (horizontal slit, reduces width of vertical ray bundle, corrects horizontal)

Question 2

Describe the location of the rays and focal lines with a stenopaic slit.

Answer 2

In front of the eye: horizontal rays focus where VFL is

Behind the eye: Vertical rays focus where HFL is

COLC is between VFL and HFL

Question 3

What will give the patient the best VA during stenopaic slit?

Answer 3

Smallest

Question 4

What must be done before introducing lenses?

Answer 4

Add plus lenses to fog patient so COLC is not on the retina

Question 5

How many times is BS done during stenopaic slit?

Answer 5

3 times, once in beginning, once with slit in preferred position, once 90 degrees away