BINOCULAR BALANCING

Question 1

aim of BB

Answer 1

achieve equalization of accomo between 2 eyes

Question 2

when can we do alternate comparison? what is the target?

Answer 2

when VA is same in both eyes

4 lines above best VA

Question 3

what are the steps in alternate comparison?

Answer 3

• *done binocularly
  1. fog both eyes with +1.00 DS (tell px that lens will blur their vision)
  2. ask if left eye or right eye is clearer (or same )
  3. add +0.25 ds to better eye and repeat until both eyes are equally blur
  4. if reversal occurs, remove lens that cause reversal

Question 4

how do we check bvs binocularly in AC?

Answer 4

slowly remove the lenses in 0.25 steps and check with px if vision improves with each step

**always put in the step before removing the current lens
ensures that accommo is relaxed

Question 5

when can we do modified humphriss? what is the target?

Answer 5

can be done for both equal or unequal VA

target: best VA

Question 6

what are the steps in modified humphriss?

Answer 6

• *done one eye at the time
  1. place +1.00 DS in non tested eye
  2. look at best VA line and perform 0.25 challenge (max plus and min minus) **take note that instruction should be MORE COMFORTABLE
  3. check VA
  4. repeat for other eye