Subjective Refraction Flashcards
1
Q
What is subjective refraction
A
Involves the patient making conscious decisions so that a prescription that has been approximated by objective means (retinoscopy) can be fine-tuned.
2
Q
When should subjective refraction start in the OSCE
A
should start within 10 minutes of the refractive process and take no longer than 10 minutes
3
Q
What are the stages of subjective refraction
A
- refining the sphere
- refining the cyl axis
- refining the cyl power with sphere compensation
- duochrome testing
- binocular balance testing
- MR and PCT
- near vision testing
4
Q
How is binocular balance tested
A
with both eyes open
5
Q
What is the MR and PCT used for?
A
used to assess the tendency of the eyes to dissociate, and to establish if prisms are required to control a symptomatic tropia.
6
Q
What light should subjective refraction be conducted in?
A
conducted in good light - so when you put your retinoscope down, turn the lights back on.
7
Q
A
