In many ophthalmic operations performed with the eye under local anesthesia it is desirable to keep the eye not under operation open in order to facilitate movement of the eye being operated on as needed to enhance the ease and security of the operative procedure. This is particularly true in operations on the extrinsic muscles, magnet operations, iridectomy or cataract extraction.
In an operation for cataract a "parasol" device is particularly valuable when the eye not operated on has previously been operated on for cataract and is therefore aphakic and highly sensitive to light. In such instances the light used during operation glares into the eye not being operated on almost intolerably, so that the patient constantly attempts to close the eye or looks hither and yon in an attempt to avoid the discomfort of the glare, thereby markedly interfering with the ease and progress of the surgical procedure.
Wilson B. A "PARASOL" FOR USE IN OPHTHALMIC SURGERY. Arch Ophthalmol. 1936;16(3):504–505. doi:10.1001/archopht.1936.00840210178016
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