Lecture 2 - Retinoscopy review

Question 1

If L, O, A, and D are all zero, their sum is zero, and the rays are still parallel when they enter the world, where will he focal point be?

Answer 1

At infinity, 100/0

Question 2

If the focal point of the reflex is at infinity and the doctor’s eye is 50 cm away with the retinoscope’s sleeve DOWN, what kind of motion will the doctor see?

Answer 2

With motion

Question 3

Your patient is a 2.0 diopter hyperope using 0 D of accommodation while looking at distance with no lenses. The doctor’s eye is 50 cm away with the retinoscope’s sleeve DOWN, what kind of motion will the doctor see?

Answer 3

With motion.

Explaination.
LOAD = -2, therefore it is beyond infinity

Question 4

Your patient is a 2.0 diopter hyperope using 0 D of accommodation while looking at distance through a +3.00 lens. If your eye is 50 cm away, what kind of motion will you see?

Answer 4

With motion.

LOAD= +1, therefore 100/1=100 cm from the pt. eye.

Question 5

Your patient is a 1.0 diopter myope using 0 D of accommodation while looking at distance through no lens. Your eye is 50 cm away, what kind of motion will you see?

Answer 5

With motion.

Load = +1
100/1 = 100cm from the pt. eye

Question 6

Your patient is a 4.0 diopter myope using 0 D of accommodation while looking at distance through a 0 D lens. Your eye is 50 cm away, what kind of motion will you see?

Answer 6

Against motion.

Load = +4
100/4 = 25cm from the pt. eye. Since the dr. is 50 cm away, the focal point is infront of the dr. therefore you will see against motion.

Question 7

Your patient is a 6.0 diopter myope using 0 D of accommodation while looking at distance through a -4 D lens. Your eye is 50 cm away, what kind of motion will you see?

Answer 7

Neutral.

LOAD = +2
100/2 = 50 cm. Since the distance is 50 cm, the reflex hits at the entrance of the dr.'s pupil.

Question 8

Your working distance is 50 cm and you find neutrality with a +4.00 lens. What is the pt. ametropia?

Answer 8

2D of hyperopia

LOAD = +2.00 and L=+4, then D= -2.00

Question 9

True or False. Brightness, Thickness, Reflex and Skew are the 4 methods of indentifying the principle meridians?

Answer 9

False. Reflex is not one.

Brightness, Thickness, Break and Skew