Ophthalmology
Retinal Injuries from a Handheld Laser Pointer
Handheld laser pointers are commonly used in lecture halls and are considered to be harmless and safe. However, laser pointers can cause severe eye injury, as demonstrated by the case of a 15-year-old boy.
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http://www.nejm.org/doi/abs/10.1056/NEJMc1005818?ai=rv&af=R...
New England Journal of Medicine