Schubert1 has recently shown that the accommodation of the normal human eye from far to near is accompanied by a direct-current change in potential which may be recorded from suitable electrodes placed on the conjunctiva in the region of the limbus. Schubert used the shell of a contact lens, from which the corneal section had been removed, onto which a silversilver chloride electrode was attached. With suitable anesthesia of the cornea, this technique is probably satisfactory for making a few measurements. However, when a large number of measurements are required, over extended periods of time, we have found that severe damage to the corneal surface can result because the cornea of the eye rubs against the border of the lens, from which the corneal section was removed, whenever the eye chances to look to one side or the other. The present paper will describe a safer technique
ALPERN M, ELLEN P, GOLDSMITH RI. The Electrical Response of the Human Eye in Far-to-Near Accommodation. AMA Arch Ophthalmol. 1958;60(4):592–602. doi:10.1001/archopht.1958.00940080612007
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