3101 Closed Stereoscope, Handheld
This handheld home vision therapy instrument incorporates a closed viewing head to reduce external reflections. Particularly effective for exophoria training. All Keystone View Stereoscopes are precision instruments, reasonably priced and ruggedly built for a long service life.
- Lens separation of 85 mm accommodates varying PDs as well as adequate base-out stimulation
- +5.00 D lens system accommodates any distance between near point and infinity within a 200 mm working range (the focal length of the lenses)
- Each number on the calibrated shaft marks 0.25 D change in accommodation
- Optional pedestal mount