Short sight (Myopia)
Also known as myopia, vision is clear up close but distant objects are blurred.
This is because light from distant objects focuses before it reaches the retina (see diagram upper right), the photosensitive layer at the back of the eye that converts light rays into electrical impulses. These impulses travel along the optic nerve to the brain where they are turned into images.
A spectacle or contact lens of the correct power changes the path of the incoming light so that it focuses perfectly on the retina, as it would in a normal eye (see diagram lower right).
Myopes need glasses for many everyday activities, such as driving, watching television or sports.
Many myopes wear their glasses full-time.
Everyone’s vision changes over time and you may experience one or more of the above conditions. That is why it is important to have regular eye examinations.
All images on this page have been supplied courtesy of Hoya Lens UK.