Plastic

Ultraviolet Filter UV400 Protects from ulta-violet light A, B, and C in that part of the visible spectrum from below 286 nm up to the 380nm wavelength.

'Skeet' Contrast Filter Maximises contrast, ideal for sporting activities, especially skiing and shooting.

Retinitis Pigmentosa Filter A deep red/brown filter, helps provide colour contrast and shape definition. Mayalso be useful in macular degeneration, glaucoma and extreme photophobia.

TintX VDU and Artificial Lighting Filter A bluish green filter, available in two intensities, TintX helps counteract eyestrain associated with working with VDUs and in artificial, particularly fluorescent light. More effective when combined with an anti reflection coating.

Glass

Luxil is a yellow/ amber contrast filter that reduces glare and which some patients find it useful for activities such as shooting.

Thermal Toughening Glass lenses are toughened to standard or industrial specification, by the application of heat almost to melting point, followed by rapid cooling, which strengthens the structure of the glass by compressing the molecules into a closer mass.