Short-wave rays of light (ultraviolet and blue) produced by sunlight interact with the compounds contained inside the eye to form free radicals. These highly reactive molecules are deactivated by an array of anti-oxidant compounds such as vitamin C, vitamin E in high-fat environments, zinc, selenium, polyphenols produced by fruits/vegetables such as bilberry. Lutein is a body that is present naturally in the eye. It is concentrated in an area known as the macula or yellow spot, which receives most of the rays of light. Lutein is a body belonging to the family of carotenoids, which filters and deactivates ultraviolet and blue light. After a certain age, lutein concentrations decline and the yellow spot may lose some of its efficiency. Lutein supplements help to stabilise acuity and the visual field. Selenium and anti-oxidants play a part in the anti-radical defences of crystalline; the lens enables us to accommodate, to adjust our vision. Like most components of the eye, it is subject to the action of free radicals produced by rays of light. Supplements of selenium and anti-oxidants help preserve the transparency of crystalline. OPHTALNET is a lutein-based formula made from extracts of blueberry, maritime pine, trace elements and vitamins C and E. These various constituents help to maintain an optimal level of lutein and to fight oxidative stress brought about by rays of light and external factors that produce free radicals. Unwanted side-effects: some sensitive people may experience digestive problems.