Double vision in photography and optics refers to the effect seen through binoculars or similar optical devices when the internal prisms or lenses are misaligned or the body of the device is damaged. Instead of a single, clear image, the viewer sees two overlapping or separate images that cannot be merged.
This issue can occur due to physical impact, wear, or mechanical stress on the optical system. Correcting double vision typically requires professional realignment or repair of the prisms and lenses to restore proper image convergence and clarity, ensuring accurate viewing and precise focus for photography or observation.