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Ocutech® Inc. • Bioptics for Low & Impaired Vision • Call 919-967-6460
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Choosing The Right Power

Choosing The Right Power

Why not prescribe a higher power for better visual acuity?

Generally telescope power should be selected to provide at least 20/40 (6/12) (0.5) acuity through the device.

If we prescribe a higher power than needed to provide the desired acuity through the device, the field of view of the telescope will be narrower and there will be greater demand for the wearer to keep their head still to stabilize the image. So, while it’s not unreasonable to consider a higher telescope power than the minimum required, it may make adaptation to the telescope more challenging for your patient.

For a telescope acuity goal of ~20/40 (6/12) (0.5) suggested telescope powers are:

Visual acuity through best correction (if needed) Suggested powers(s)
20/50- 20/70 6/15-6/20 .40-.32 1.7x
20/70- 20/100 6/20-6/30 .25-.20 2.2x
20/100-20/150 6/30-6/45 .20-.13 3x
20/150-20/200 6/45-6/60 .13-.10 4x / 5x
20/200-20/300 6/60-6/90 .10-.06 5x / 6x