Features

Coloured filters and the eye

Clinical Practice
Jennifer Birch reports on the latest theories on light damage to the eye which were discussed at a recent international symposium hosted by City University

groupfilters06.jpgLate last year, City University hosted an international symposium to discuss the protective functions of intraocular filters. Fifty delegates from the UK, Europe and the US attended a total of 18 lectures and workshops, including a demonstration on techniques for measuring macular pigment density.

The lens and macular pigment (MP) are both important intraocular filters which protect the eye from the damaging effect of ultra violet and short wavelength light (‘the blue light hazard’). UV protection is provided by the lens. Optical density increases with age and lens yellowing provides additional protection in the visible range.

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