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Clin Exp Ophthalmol. 2011 Jan;39(1):30-6. doi: 10.1111/j.1442-9071.2010.02403.x. Epub 2010 Oct 19.

Comparison of two ophthalmoscopes for direct ophthalmoscopy.

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1
College of Medical and Dental Sciences, University of Birmingham, UK.

Abstract

BACKGROUND:

To measure the ease of use and performance of the Optyse lens-free ophthalmoscope compared with the standard Keeler pocket ophthalmoscope, and to assess its suitability as an inexpensive ophthalmoscope for medical students.

DESIGN:

Randomized cross-over study.

PARTICIPANTS:

Twenty second-year medical students, 10 as ophthalmoscopists ('observers') and 10 as 'patients'.

METHODS:

Students used both ophthalmoscopes to examine the optic disc in each eye of 10 'patients'. They were randomized as to the order in which they were used. A Consultant ophthalmologist was used as the gold standard.

MAIN OUTCOME MEASURES:

Main outcome measures were 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 and 113/200 with the Keeler. Accuracy of VCDR estimates was better with the Optyse 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 versus 6 (3-8) for Keeler (P = 0.648). OEOU for 20 scores: median (IQR) of 6.5 (2-9) for Optyse versus 5.5 (3-8) for Keeler (P = 0.21).

CONCLUSION:

Medical students found the Optyse and Keeler pocket ophthalmoscopes to be of similar ease of use and performed slightly better with the Optyse when estimating VCDR. The lens-free Optyse ophthalmoscope is a reasonable alternative to the standard Keeler pocket ophthalmoscope.

[Indexed for MEDLINE]
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