How eyesight works

Up close shot of older female eye behind eyeglass lenses

Focus on your vision

Your eyes allow you to see shapes, colours and movement, as well as to perceive distance, height and other variables around you.
Animation showing how you see using a tree to demonstrate

How you see

You are able to see things thanks to the light that is reflected off the objects you look at – a light which enters your eye through the pupil. Together with the lens, the cornea bends (refracts) the light to focus on the retina at the back of your eye. The retina is covered with millions of light-sensitive cells called rods and cones. Cones are responsible for daytime vision – and allow you to see images in colour and detail – whereas rods are responsible for night vision. The retina converts light into electrical signals. These pass along the optic nerve to your brain, which then processes them to create an image.

Animation showing how you see using a tree to demonstrate
Female brown eye up close

How you focus

The lens of your eye focuses the image. It does this automatically, using muscles to change shape and help focus on objects at different distances. The iris, the coloured part of your eye, controls the amount of light passing through the pupil into your eye.

Woman getting having  an eye test by a male Hoya Vision optician

Taking care of your vision

Visit your optician regularly to have your eyes examined. In between examinations, if you notice a change in or become concerned about your eyesight, contact your nearest Hoya Vision optician. Hoya Vision lenses offer vision correction and its coatings/treatments can also protect your eyes . Detecting and treating problems early can help maintain good vision for the rest of your life.