retinoscopy

Question 1

a pt has a retinoscopy finding of +3.50 Ds -0.50DC x 090 at 66cm. what is the final SpecRX after the working distance is removed

Answer 1

+2.00 -0.50 090

Question 2

the duchrome test utilizes what kind of optical aberrations

Answer 2

chromatic

RAM GAP

Question 3

a patient’s refraction is +2.00DS OD. On duochrome test, the patient notes the letters on the red side are clearer. what is the final power of the RX

Answer 3

+1.50

RAM GAP

Question 4

binocular balance

Answer 4

performed at the end of the subjective refraction to balance accommodation between the eyes. it is typically performed by prism dissociation Sio that the patient can compare the images of the two eyes. the end point is when the images in each eye appear equally clear.

not ideal for people with unequal acuities.

Question 5

Turville infinity balance technique

Answer 5

septum is placed so that the right side of the chart is seen only by the right eye, and the left side of the chart is seen only by the left eye, but the peripheral portion of the chart is seen by both eyes. the refraction is performed binocularly to create a more natural environment for the patient

Question 6

what type of binocular balance should be done on someone with different acuities in each eye

Answer 6

bi-ocular balance with prism