Bed prism glasses are special eyeglasses designed for people lying down or with a limited range of motion in their necks. These glasses use prisms to change the direction of light, allowing the wearer to see objects in front of them without lifting or moving their head. Bedridden individuals often use them or have difficulty holding their heads up for extended periods.
The glasses are typically shaped like regular eyeglasses but have prism lenses that create a 90-degree angle so that when the wearer is lying flat on their back, they can still see straight ahead as if they were sitting upright. This allows them to read, watch TV, or engage in other activities without straining their neck or back.
Bed prism glasses can be beneficial for people with medical conditions requiring them to be in bed for long periods or for those with neck or spine issues that make it uncomfortable or difficult to keep their heads up. They are also sometimes used in hospitals to help bedridden patients be more comfortable lying flat.