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DL MacKersie, MJ Goff, R Lane, J Reed, J Taboada, J Jumper; A Comparison of Corneal Light Shields for Prevention of Retinal Phototoxicity> . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3494.
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Purpose: To compare the efficacy of nine commercially available or commonly used corneal light shields. Methods: Commonly used materials were fashioned into corneal light shields of 6.0mm and 8.5mm. Two commercially available light shields were also examined. 20 porcine eyes were prepared with a silicone photodetector placed in a surgical posterior scleral window. Operating microscope light intensities were measured with and without each shield in place. Measurements were also taken with a 505 nm filter in place. Results: Average attenuation of total light ranged from 0-17.6%. Average attenuation of light at 505nm ranged from 26-79%. One-way Analysis of Variance showed clinically significant differences in the mean attenuation of the corneal light shields for both total light (p<0.001) and for 505nm light (p<0.001). The highest attenuation levels were recorded with the Hessburg 8.5mm shield (total light 17.6% and 505nm 75.6%) and a 8.5mm brown surgical glove (total light 10.4% and 505nm 78.9%). Several light shields had very low amounts of attenuation (less than 6.0% attenuation of total light or less than 30% attenuation of 505nm light). Increasing the diameter of the shield from 6.0 to 8.5mm greatly increased the amount of light blocked in all cases. Conclusions: Several commonly used shields provide little photo-protection. Surgeons should choose a corneal light shield of appropriate material and diameter.
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