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July 1934


Author Affiliations

Huntington, W. Va

Arch Ophthalmol. 1934;12(1):101. doi:10.1001/archopht.1934.00830140111012

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Little is mentioned in the literature about the practical use of the stenopeic slit lens to improve the vision. I have ordered smoked glasses for several of my patients in which the principle of the stenopeic slit is used. With spectacles of this type, the visual field is diminished ; however, the blur arising from aberration, regular or irregular astigmatism, etc., is considerably, and at times completely, eliminated. To enlarge the visual field, I widen the stenopeic slit by a semicircular opening either in the center or toward the nasal side, according to the need for distant vision or for close work. The average width of the slit is from 1.5 to 2 mm.; the diameter of the semicircular opening varies from 3 to 6 mm. as shown in the illustration.

In eyes with corneal leukoma, congenital nuclear cataract and other opacities of the transparent media, the vision can

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