Prism glasses bend and redirect light before it meets the eye. They may help improve double vision for people with an eye misalignment or condition. If an eye doctor suspects someone may benefit from ...

MR. C. D. AHRENS, the veteran prism-cutter, has lately devised a new type of liquid prism, which seems to have some advantages in optical work, both for direct-vision and for ordinary patterns of ...

Diplopia (double vision) is a rare but disturbing condition. It happens when the images of objects before you are formed in different parts of the retinas in your two eyes. Many disorders of the eye ...