A makeshift retinoscopy rack.
A simple makeshift retinoscopy rack consists of various trial lenses placed into the slots of a nonfrosted, 35-mm slide viewing sheet. It is useful in determining the patient's refractive error at the bedside and in the operating room.
D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*; D012029:Refraction, Ocular