The Arclight Ophthalmoscope: A Reliable Low-Cost Alternative to the Standard Direct Ophthalmoscope

Figure 3

A histogram of the frequency of ease of use score for the Arclight and Heine direct ophthalmoscopes. 3: could identify red reflex. 4: could see vessels but not disc. 5: could identify disc but not vertical CD-ratio (VCDR). 6: could determine VCDR with a high level of difficulty. 7: could determine VCDR with a medium level of difficulty. 8: could determine VCDR with a low level of difficulty.