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Design Considerations

Eliot L. Berson, MD; Leathem Mehaffey III, PhD; Arnold R. Rabin, MSEE

Arch Ophthalmol. 1974;91(6):495-500.

Abstract
A Generation II night vision pocketscope has been shown to be effective in eliminating the symptom of night blindness in patients with retinitis pigmentosa. This pocketscope provides sufficient light amplification to allow cone function under scotopic conditions. Minimum pocketscope gain and minimum output screen luminance required for mobility by these patients under scotopic conditions are correlated with their cone threshold elevations above normal. Instrument gain and output screen luminance should be minimized to extend the period of usefulness of the instrument and to protect the patient against the possible harmful effects of excessive light exposure. The advantages of a wide-angle lens and infrared light-emitting diode, attached to the pocketscope, are considered.

Author Affiliations
Boston

From the Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston.

Footnotes
Submitted for publication Oct 23, 1973.

Reprint requests to Massachusetts Eye and Ear Infirmary, 243 Charles St, Boston 02114 (Dr. Berson).

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