There has been a steady decline in the amount of time dedicated to ophthalmology training in medical school,1 which leaves many physicians unable to perform adequate direct ophthalmoscopy.2 However, this is a useful clinical skill that allows the clinician to assess the red reflex, retina, and optic nerve. Visualization of the optic nerve is of particular interest to physicians of many specialties, and a host of abnormalities (including neovascularization, swelling, hemorrhages, and atrophy) can be seen there.
Gunasekera CD, Thomas P. High-Resolution Direct Ophthalmoscopy With an Unmodified iPhone X. JAMA Ophthalmol. Published online November 29, 2018. doi:10.1001/jamaophthalmol.2018.5806
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