The high quality grey coloured filter glasses can be worn independently or over normal spectacles.  They enhance contrast, filter out harmful ultra violet light and reduce dazzling and photosensitivity.  They are especially suitable for outdoor use. The filter spectacles fit closely to the head with a darkened upper edge which helps to shield the eyes from light.  The grey filter has an absorption range which ensures a high transmission of light through the filter and absorbing elements of UV light.  These grey tinted spectacles are good for outdoor use and reflex reduction.