What Causes Long Sight?


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Hypermetropia is also referred to as ‘long-sight’. This implies that a child who is ‘long-sighted’ can see distant objects more clearly but are unable to see objects properly that are near him. In such conditions it has been observed that children with Hypermetropia do not have difficulty with their vision while watching the television or seeing the blackboard but may have problems while reading a book. They may have to focus intensely in a bid to see things clearly that are close to him. This may give rise to eye strain and headache.
Mild hypermetropia is frequently and usually found in the majority of young children. Hypermetropia gradually ceases to exist in a large number of children when they reach adulthood.
Light must be focused correctly onto the retina at the rear of the eye for clear and easy vision. The majority of hypermetropic eyes possess the capability of focusing the light from a distant object. However a large number of hypermetropic (or long-sighted) eyes have problems in focusing the light from an object that is near. In this case the light focuses to a sharp point at the back of the retina. The vision becomes subsequently unclear. If the object is placed at a distance away from the eye, the point at which the light focuses properly will shift forward onto the retina. An object which is positioned at a greater distance subsequently becomes distinct and the eye is said to be ‘long-sighted’.
In smaller and shorter eye, the chances of the light from a far away object focusing away from the retina are quite high. The focusing capability of the cornea and lens are also crucial in giving rise to hypermetropia.
Causes of Hypermetropia

  • There are some causes for a child who in all likelihood can develop Hypermetropia.
  • Some of them are: If their parents happen to be hypermetropic (long-sighted) and the condition is passed on to them.
  • An existing eye condition that may give rise to Hypermetropia

There are a number of instances of children who are long sighted even though their parents do not posses long sight or the children themselves do not suffer from any other eye condition.
For the eye to develop normally, it is imperative for the light to enter the eye without being obstructed. If a child possesses an unclear cornea (corneal dystrophy) or lens (cataract), a sufficient amount of light cannot enter the eye and the eyesight will become hazy. This has an effect on the natural development of the eye and is likely to give rise to hypermetropia.
Other conditions for instance Retinitis Pigmentosa and Microphthalmia can also be linked to hypermetropia.

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