Lens Rock- Binocular

What is the objective for Binocular accommodative facility/lens rock?

Decrease the latency of accommodation and increase the speed of accommodation response under binocular conditions.

What is recorded for binocular accommodative facility/lens rock?

• Cycles able to perform

• Power of lenses

• Difficulty with plus or minus lens

• Target size used

• Level 2: time to perform (cycles per minute)

What equipment is uesd for binocular lens rock?

• Flip lenses in various powers

• Accommodative rock cards or other age appropriate reading material

• Red/green or polaroid bar reader

• Red/green or polaroid glasses

How is binocular accommoodative facility/lens rock set up?

• Place bar reader on near material at 40 cm

• Place polarized or red/green glasses on patient

• Hold flippers before eyes

How is binocular accommodative facility performed?

1. Ask patient to clear print and read letter/word

2. Flip lenses and clear/read next target

3. Stress that letters should be visible through both sets of bars at all times

4. Work on clarity than speed

What are some supports that can be used for binocular accommodative facility/lens rock?

• larger print size

• Lower powers

What questions should you ask the patient as they perform the binocular lens rock?

• With which lens does the print get larger? Smaller? Plus is larger

• With which lens do you feel more strain or effort? Minus

• Does the lens make you look close or far away? close is minus

• With which lens is it easiest to see all 4 lines? Subjective answer.

What are the goal/endpoints for binocular accommodative facility/lens rock?

+/- 2.50 flippers, clearing >10 cpm without suppression

Where is binocular lens rock typically performed?

Often used as a home activity.