Refractive Status

Question 1

What’s is the best way to measure your patient’s RE using a method that allows them to see the difference in VA?

Answer 1

Just noticeable difference

- subjective measurement may be unreliable

Question 2

What are the 2 main sources of error in retinoscopy?

Answer 2

• accommodation (make sure it’s controlled)

- scoping off-axis

Question 3

What happens to astigmatism/spherical component when you’re scoping off-axis?

Answer 3

Astigmatism increases, Spherical component decreases

Question 4

How do you scope strabismic patients?

Answer 4

• Put prism over the FIXATING eye
• perform retinoscopy out of the phoropter
• align with the eye

Question 5

You get +3.00 in vertical meridian and +1.00 in horizontal meridian. What is the net ret if you were doing mohindra?

Answer 5

+1.75 -2.00 x 090

Question 6

Tropicamide has a mydriatic effect that last for how long?

Answer 6

4-6 hrs

Question 7

Cyclopentolate has a mydriatic effect that last for how long?

Answer 7

24 hrs

Question 8

Atropine has a mydriatic effect that last for how long?

Answer 8

7+ days

- maximum cycloplege at 3-6hrs

Question 9

How do we put properly administer the drops to perform a cycloplegic refraction?

Answer 9

• give topical anesthetic
• 2 gtts cyclo
• phenyl or tropic for mydriasis (esp in dark iridies)
• Wait 30 mins

Question 10

What are the advantages of a cyclo ret?

Answer 10

• accom. controlled