Comparison of two ophthalmoscopes for direct ophthalmoscopy.

N Mandal, P Harborne, S Bradley, N Salmon, Roger Holder, Alastair Denniston, Philip Murray

Research output: Contribution to journalArticle

8 Citations (Scopus)


ABSTRACT Background: To measure the ease of use and performance of the Optyse(TM) Lens Free Ophthalmoscope compared to the standard Keeler Pocket Ophthalmoscope, and to assess its suitability as an inexpensive ophthalmoscope for medical students. Design: Randomised cross-over study. Participants: Twenty second year medical students, ten as ophthalmoscopists ('observers') and ten as 'patients'. Methods: Medical students used both ophthalmoscopes to examine the optic disc in each eye of ten 'patients'. They were randomised as to the order in which they were used. A single Consultant Ophthalmologist was used as the gold standard. Main Outcome Measures: Accuracy in estimating vertical cup:disc ratio (VCDR), ease of use (EOU) for each examination, and overall ease of use (OEOU). Results: Of 400 attempted eye examinations, sufficient visualization was achieved in 220 cases to allow a VCDR estimation; 107/200 VCDR estimates with the Optyse(TM )and 113/200 with the Keeler. Accuracy of VCDR estimates was better with the Optyse(TM) by the equivalent of 0.05 VCDR (p = 0.002). There was no significant difference in EOU or OEOU between the two ophthalmoscopes. EOU for 400 examinations: median (IQR) of 6 (3-8) for Optyse(TM) vs. 6 (3-8) for Keeler (P = 0.648). OEOU for 20 scores: median (IQR) of 6.5 (2-9) for Optyse(TM) vs 5.5 (3-8) for Keeler (p = 0.21). Conclusion: Medical students found the Optyse(TM )and Keeler Pocket Ophthalmoscopes to be of similar ease of use, and performed slightly better with the Optyse(TM) when estimating VCDR. The lens free Optyse(TM) ophthalmoscope is a reasonable alternative to the standard Keeler Pocket ophthalmoscope.
Original languageEnglish
JournalClinical and Experimental Ophthalmology
Publication statusPublished - 26 Aug 2010


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