The eye – our window to the world

 


The human eye is an impressive system. A colourful sharp image of the environment is created on the retina due to a perfect cooperation of the cornea, the iris and the lens. The light reflected from objects in our environment enters the eye through the cornea, which has an imposing refractive power of approximately 70 % of the eye. Then it passes through the pupil, the central aperture of the iris, which widens or contracts like the diaphragm of a camera depending on the light intensity. After that, it reaches the lens which is in charge of the fine adjustment, and enhances the details. Finally, the light is focused onto the retina, a variable-resolution sensor with 3 color channels plus an ultrasensitive black and white channel. Here, optical stimuli are transformed into electrical signals. The resulting information is transferred to the brain through the optic nerve.