Easier to focus at longer distance than at close up. Vision may be blurred at near.
Hence term of long sighted as can see better further away.
Scientific name for long sight is Hyperopia or Hypermetropia and person is said
to be hyperopic.
Note - some people with higher amounts of long sightedmay also find distance vision
blurred - but near sight will be more blurred.
Why does long sight occurs ?
The eyeball length is too short and so rays of light would only be focused properly
behind the eye. So the brain tries to refocus this image by altering the shape of
the eyes internal natural lens. This is called accommodation.
This requires some effort - and more effort is needed for closer objects - hence
more difficult with closer than long distance objects. May get eye strain and headaches.
If the eye cannot focus, then would have blurred image.
If the hyperopia is low , the eye may focus without any symptoms, and eye correction
may not be required then.
However symptoms of eye strain may occur especially with prolonged tasks such as
reading for over 15 minutes and may even get blurry vision.
Treatment of long sight
By using a lens to alter the path of the light, the object can be refocused to go
onto the retina of long sighted eyes.
The lenses are convex shaped which bend light towards the retina (converge).
These lenses can be put into spectacles frames or used as contact lenses to correct
Power of these lenses are measured in Dioptres and are plus powers.
Eg +1.25 is mild power; +8.75 is higher power
Also surgical treatment is possible.
Symptoms of long sight
May vary according to amount of long sighted error. The higher amounts will also
be blurred long distance as well as close up.
The sight may be clear but could go blurry vision.
Eyestrain and headaches may occur, especially with prolonged tasks for low amounts
of long sight.
Please consult an optician or seek medical advice as blurry vision, headaches etc
may be due to other eye or health conditions.