You can see clearly straight ahead but side vision is blurred and distant vision is dim. Multiple images may also form and confuse you. Monocularly, one could achieve a legible single image with appropriate adjustment of head position. When the second eye is opened, one cannot be certain that the pin-holes before that eye will be centered for that head position. A Special Report published in the Journal of the American Optometric Association.
Modern promoters claim their products are better than conventional lenses.
Actually, both reduce the focus effort needed to read, but pinhole glasses are much less useful because they restrict contrast, brightness, and the field of view. Nothing New Those who have benefited from pin-hole spectacles are, more often than not, people who wear the wrong eyeglasses. Naturally, replacing these with pin-hole glasses will make you see better. It's doubtful, however, whether this device will improve vision defects that are pathological in origin. There is yet no evidence that cataracts, double vision and other serious eye problems will respond to pin-hole glasses.