pinhole glasses
stenopeic glasses

Occasionally, pinhole glasses are used by patients with low-level myopia.

Additionally, pinhole glasses reduce brightness and peripheral vision, and thus should not be used for driving or when operating machinery.

Pinhole glasses have been marketed by various companies on the claim that-combined with certain eye exercises-they could permanently improve eyesight.

Unlike conventional prescription glasses, pinhole glasses produce an image without the pincushion effect around the edges (which makes straight lines appear curved).

Pinhole glasses do not actually refract the light or change the focal length, they operate by reducing the size of the blur circles in the retinal images.

The same principle has also been applied as an alternative to corrective lenses: a screen of pinholes is mounted on an eyeglass frame and worn as pinhole glasses.

Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens.

While pinhole glasses are claimed to be useful for people who are both near- and far-sighted, they are not recommended for people with over 6 diopters of myopia.

They do not heal the eye of refractive error, as sometimes claimed, and vision with pinhole glasses, although clearer than without them, is not as clear as with conventional lenses.

Pinhole glasses are a type of corrective glasses that do not use a lens and are claimed to help correct the eye's refractive error without introducing the image distortion of traditional lens-based glasses.

Due to a lack of formal clinical studies to substantiate this type of claim by companies selling pinhole glasses, this type of claim is no longer allowed to be made in the United States under the terms of a legal settlement with the Federal Trade Commission.

Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens.