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Transcutaneous electrical stimulation increases corneal sensitivity 3 months after LASIK

Graefes Arch Clin Exp Ophthalmol. 2009;247(8):1133-1138.

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The use of transcutaneous electrical stimulation following LASIK significantly enhanced corneal sensitivity at 3 months, which could be linked to improved corneal nerve regeneration, a study found.

The prospective, randomized, clinical trial looked at 40 eyes of 20 patients who underwent bilateral LASIK. Transcutaneous electrical stimulation of 20 Hz was delivered randomly in one eye of each patient, with the second eye acting as control. The Cochet-Bonnet esthesiometer measured corneal sensitivity in four areas outside and five areas inside the LASIK flap, the study authors said.

"All points within the LASIK flap except the point closest to the hinge demonstrated profound corneal hypoesthesia at 1 day, 1 week and 1 month postoperatively, with no differences noted between the control and study eyes," they said.

In four points outside the LASIK flap, there was no significant difference in corneal sensitivity between eyes. However, at 3 months postop, "points within the flap had statistically significantly better corneal sensitivity in the study group than in the control group (P <.05)," the authors said.