HyperopiaOr 'Long Sight'
Hyperopia is often known as long sightedness (or in the US farsightedness) and is a common eye condition. It occurs when the eyeball is short in relation to the curvature of the cornea, meaning that near objects appear blurred while more distant ones are in focus.
How do I know if I’m long sighted?
If you have trouble seeing nearby objects and reading or computer work tires your eyes, you are probably long sighted. Long sight is not necessarily noticeable in children, but without attention can lead to a squint or a lazy eye.
Causes of Hyperopia
Hyperopia appears to be largely genetic. Old-age long sight (presbyopia) is caused by a thickening of the lens as you grow older.
What is the difference between hyperopia and presbyopia?
Presbyopia is the name given to long sight when it occurs in people over the age of 40. It affects everyone to a greater or lesser extent, and treatment for it differs slightly from treatment for hyperopia.
How long sighted am I?
How long sighted am I?
The degree of long and short sight is measured in dioptres, often abbreviated to D. Dioptres are the unit of focusing power that your eyes need to be able to see clearly. Higher numbers indicate poorer eyesight and a need for stronger glasses or lenses. Prescriptions for short sighted people always have a negative number of dioptres, while long sighted people have a positive number.
Your prescription might read +3.00D which would mean you need a lens of three dioptres to correct your long sightedness.
How does a long-sighted eye see?
The eye sees by allowing light to pass through the cornea to focus on the retina. The retina is made of light-sensitive tissue, the signals from which are sent along the optic nerve to the brain which then interprets these signals as images.
If you have hyperopia your corneas are curved in such a way that the light focuses just behind the retina, instead of directly upon it. This means that when you look at near objects, a blurred image is sent to your brain.
How to correct Hyperopia or long sight?
Glasses, contact lenses, laser eye surgery and lens surgery are all recognised ways of correcting hyperopia.
It is worth remembering that, if you have a very high prescription (more than +8.00D) LASIK might not be suitable for you. However, refractive lens exchange is an excellent alternative and, like LASIK, will give you freedom from glasses. Our clinicians will find the best procedure for you, based on your medical history and examination findings.