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It is usual to experience some discomfort from glare in bright conditions. People commonly screw up their eyes in an attempt to reduce the light entering the eye. This can fatigue the muscles across the forehead and result in headache. Wearing sunglasses will improve these symptoms. However, tinted lenses alone are insufficient to protect against UV light, your sunglasses must also have UV protection.

Tints – a tint on your lenses is only there to make your vision more vision more comfortable. In bright light, the pupil constricts to limit the amount of light entering the eye. When a tinted lens is worn, this causes the pupil to dilate, allowing more light and therefore UV to enter the eye. It is very important that any tinted lens you wear also protects against UV light.

UV filters – UV filters come in different forms, 400nm (99-100% UV blockage) is appropriate for general use. Some are clear and others may have a slight yellow tinge.

Colours – tints can come in many different depths and colours, the most popular being brown and black. The depth/colour of a tint depends on personal choice and comfort, so long as they have 99-100% UV absorption.

Photochromic lenses – commonly referred to as ‘react to light’ lenses, these lenses change their depth of tint according to how bright the weather is. When it is sunny, the high amounts of UV radiation cause the lens to become ‘active’ and darken. When the weather is dull, the lenses are inactive and therefore stay clear. They are particularly good for those who are light sensitive or have had cataract surgery.

Polarised lenses – these lenses work like a venetian blind, blocking light which has reflected off a road surface, water or snow in different angles into one plane. They are excellent for fishermen and those who drive for a living.