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Basic Principles of Light and Glare Control
Filters that reduce the transmission of shorter wavelengths of light frequently benefit low vision patients. Zigman has demonstrated photographically that these yellow and amber filters reduce chromatic aberration, light scattering and fluorescence. Evaluation should include considerations of both inside and outside glare problems. Hats and visors may be used to reduce ambient glare as well. Both the patient and family should be counseled in control of glare and use of adequate task lighting.
Soft contact lenses with central red or amber filters reduce the severe photophobia of patients with achromatopsia and cone /rod dystrophies. In aniridia, a congenital lack of the iris, soft contact lenses can be painted to create artificial irises and help reduce the extreme photophobia these patients experience.
NoIR Medical Technologies NoIR Medical Technologies offers Ultraviolet and Infrared protection, glare reduction, contrast enhancement and other specialized sunglasses and light filters for the visually impaired. With seven styles in over fifty colors and light transmissions, NoIR is committed to helping low vision patients achieve the best possible quality and comfort out of life. NoIR also manufactures protective eyewear for laser surgeons and technicians, as well as hand held,contrast and text enhancing magnifiers.
Red Central Contact Lenses for Achromatopsia Red central contact Lenses are used for patients with achromatopsia and some cone dystrophies. Red central contact lenses reduce the severe photophobia (light sensitivity), improve contrast and in some patients may help see the color red.