The Blue Light

 The eye’s cornea and lens cannot filter or deflect Blue Light. Photochemically-induced retinal injury is caused by the absorption of light by photoreceptors in the retina. Photoreceptors such as rod cells, cone cells & photosensitive ganglion cells convert light into electrical signals in the eye. Normally, when light hits a photoreceptor, the cell bleaches and becomes ineffectual until it has recovered through a metabolic process called Wald’s visual cycle. This visual cycle is the biological process that converts photons, such as electromagnetic radiation (UV light & Blue Light) into electrical signals in the retina. When the retina is constantly and repetitively subjected to the presence and absorption of Blue Light, at a wavelength 400 – 500 nm, rod cells & cone cells become unbleached and responsive again to light before they are ready. A few minutes of exposure to Blue Light at 408nm is enough to cause permanent death of photoreceptors and lesions of the retinal pigm