With the most powerful light system available at 22 watts, in tungsten, the Fison will make viewing the retina through cataracts, vitreous and blood a problem of the past.
from Keeler Instruments Inc. for Fison Indirect Ophthalmoscope - Headset Only
Essilor - OPH 500 Professional Ophthalmoscope 3.6V from Essilor Instruments USA
Essilor - RET 500 Combi Retinoscope LED 3.6V from Essilor Instruments USA