After experimenting for a considerable time with transilluminators made of plastic materials, I have come to the conclusion that the most practical method of delivering the brightest possible light at the point of illumination is one by which the light source is in direct apposition to the eye. The accompanying illustration depicts a pair of transilluminators which I have found to be effective. They are adapted to fit into the handle of the standard ophthalmoscope and carry a tiny 2 volt bulb at the tip.
A straight model is employed for transillumination of the anterior segment of the eye and a curved form for retrobulbar transillumination. The straight transilluminator has a post 6 cm. in length and 3 mm. in diameter. The end tapers flush with the bulb, so that only 1.25 mm. of the curved glass is exposed. The diameter of the bulb at this level is only 2
Friedman B. OCULAR TRANSILLUMINATORS. Arch Ophthalmol. 1940;24(4):796–797. doi:10.1001/archopht.1940.00870040182017
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