Therapeutic Lenses
Contact lenses, or therapeutic lenses, are thin lenses that are placed on the surface of the eye. While some wear them for cosmetic reasons, their primary function is to correct and improve vision problems related to refractive errors, act as a protective layer in...
Keep Your Eye on the Ball: How Vision Therapists Use Marsden Balls to Help Their Patients
A Marsden ball might not look very impressive, but this little ball offers big benefits for athletes and children affected by strabismus, ambylopia and other conditions. Marsden ball exercises are just one of the techniques that vision therapists use to help patients...
Prisms
A prism has the same cross-section across the entire length of its shape. When used in eyeglasses, they often correct abnormalities associated with nearsightedness, farsightedness and double vision. Eyeglasses, or corrective lenses, reduce or increase the size of the...
Filters
Optical filters carefully transfer light in a specific range of wavelengths or colors while obstructing what remains. These dyed plastic or glass devices are placed in the optical path. They are described by their frequency response, and this identifies how the scale...
