Eyes are a complex part of the body and can be affected by a range of specific conditions, as well as by illness and disease in the rest of the body.
Understanding what your optician has told you about your eyes can be bewildering.
However, many vision experts online are here to help - Cooper Vision, for example, a leading contact lens maker, has published a comprehensive list of eye care terms and conditions.
People looking to buy contact lenses online could click on the company"s website too and find out more about their condition.
For example, it describes astigmatism as a condition caused by an "irregularly shaped cornea - shaped more like a football than a baseball - resulting in two focal points causing light images to focus on two separate points in the eye and resulting in a blurred or distorted image".
Astigmatism can be corrected using contact lenses or glasses.
In addition, it notes that conjunctivitis, or Pink Eye, is the inflammation of the conjunctiva - which is the tissue lining the inside of the eyelid and helps keep the eyelid and eyeball moist.
This is a common complaint potentially caused by a variety of factors and is treatable.
by Emily Tait