Eye and correction of defects
The eye is an organ that detects optical information. It detects visible light which has a wavelength of between 380 and 700 nm (the wavelength of light is expressed in nm, or nanometers, one nanometer is one millionth of a millimeter). Under 380 nm UV light, which is extremely harmful to the eye, as it could be irreparably damaged. We recommended lenses, with UV protection – particularly sun glass must be of high quality, so that it does not cause damage to the eye. Above 700 nm, the IR (infrared) light or heat radiation is dangerous to the eye.
Visible path begins with the reflection of a light from an observed object. Light travels through the cornea, where the refraction begins, to the pupil. This is an opening in the iris, which varies in diameter and thus controls the amount of light that enters the eye – in the bright light it narrows (2mm), in low light conditions opens to 8mm. The light is then refracted in the lens crosses the vitreous transparent and cracks in the macula. It also contains photoreceptors which, under the influence of light send electrical signals via nerves in the optical center in the brain, where image is created and processed.