A simple eye model for objectively assessing the competency of direct ophthalmoscopy

BACKGROUND: Direct ophthalmoscopy is an important investigative technology not only for ophthalmologists, but also for general practitioners and other specialists. The purpose of this study was to develop a simple and robust eye model for effective and objective assessment of ophthalmoscopic competency. METHODS: A series of eye models were assembled using commonly available materials, including 26-mm-diameter double-hemispherical brown plastic balls and convex lenses. A 6-mm circular opening was drilled on one hemisphere as a pupil behind which the lens was glued to provide the refractive component. Ten pieces of letters were placed on the inner surface of the other hemisphere. Ophthalmoscopic skills of ophthalmologist residents were first subjectively assessed using a checklist by two tutors and then objectively by using the eye models. The discrimination index was calculated to evaluate the effectiveness of assessment. Finally, a feedback questionnaire was completed. RESULTS: Totally 76 residents were recruited. The checklist score was 9.25 ± 0.47, with a discrimination index of 0.11. The model-assessment score was 4.24 ± 3.10, with a discrimination index of 0.79. There was no correlation between the checklist score and model scores (r = 0.133, P = 0.251). Two-thirds of the participants agreed or strongly agreed that model-assessment could reflect the ability to visualize the fundus. CONCLUSIONS: We have developed simple eye models to assess the competency of ophthalmoscopy with excellent discriminatory power to differentiate competence levels of ophthalmology residents.