Thursday, October 25, 2007

Retinopathy from a Green Laser Pointer

Dennis M. Robertson, MD; Jay W. McLaren, PhD; Diva R. Salomao, MD; Thomas P. Link, CRA

Arch Ophthalmol. 2005;123:629-633.

Objective To report retinopathy following exposure to light from a commercially available class 3A green laser pointer.

Methods A 55-year-old woman with a ring melanoma was scheduled for enucleation. The eye (visual acuity 20/20) had a healthy-appearing macular retina. The retina was exposed to light from a commercially available class 3A green laser: 60 seconds to the fovea, 5 minutes to a site 5° below the fovea, and 15 minutes to a site 5° superior to the fovea. Color photographs were obtained before and after exposure. The eye was enucleated 20 days after exposure.

Results Laser power measurements averaged less than 5 mW. Retinopathy was observed 24 hours after laser exposure. This was characterized by a yellowish discoloration at the level of the retinal pigment epithelium (RPE) in the subfoveal region and at the site superior to the macula where the retina received 15 minutes of laser exposure. Each site developed granular changes at the level of the RPE within 5 days of exposure. Histologic study showed RPE damage in the exposed subfoveal and parafoveal regions.

Conclusion A class 3A green laser pointer caused visible retinopathy in the human eye with exposures as short as 60 seconds.

Author Affiliations: Department of Ophthalmology, Mayo Clinic, Mayo Foundation, and Mayo Medical School, Rochester, Minn.

1 comment:

Laser Pointers said...

Green laser pointer having more powerful from others.