Holes in clear lenses demonstrate a pinhole effect.
This study describes a new variant of the pinhole principle. Holes drilled in clear plastic lenses held in combination with a blurring lens can overcome the blurring effect much as a traditional pinhole. Specifically, this study shows how holes of different diameter placed in lenses of different spherical power can improve visual acuity that has been degraded by a series of blurring spherical lenses. In general, the hole in the clear lens improves visual acuity for progressively stronger blurring lenses.
Zacharia
P
P
Ophthalmology Unit, Beth Israel Hospital, Boston, MA 02215.
Miller
D
D
D003519:Cyclopentolate; D006801:Humans; D007909:Lenses; D009885:Ophthalmology / Q000379:methods*; D055095:Optics and Photonics; D014792:Visual Acuity
D003519:Cyclopentolate