Eye - When we view objects
the normal eye receives information from light rays focusing at a
distance. The cornea, at the front of the eye, bends those light ways
to the crystalline lens, which further bends them until the image of
the object is sharply focused on the curved retina at the back of the
Eye conditions that result in less than perfect vision are caused by
unusual curvatures in the shape of the eyeball or age-related problems.
- Also called Hyperopia, sees distance better than near, results from
light coming into focus behind the retina. To correct this problem a
converging lens (one with + sphere power) is used to bend the light
- Also called Myopia, sees near better than distance, results from
light coming into focus before the retina. In order to correct this
problem a diverging lens (one with - sphere power) is used to bend the
- As people age their eye loses the ability to accommodate (the natural
capability to produce clear images on the retina by the stretching or
relaxing of the crystalline lens) because the muscles around the eye
becomes more rigid. This results in difficulty focusing on near
objects, causing a condition known as Presbyopia.
This condition requires multiple vision corrections, all of which
should be accomplished with a multi-focal lens.
- Astigmatism results from a cornea that is not spherical causing objects to appear out
of focus in an otherwise normal eye.
A correction for astigmatism can be put into any type lens (single
vision or multi-focal) and is found in the cylinder power of the lens
prescription. Two different power curves are ground at right angles in
the back of the lens to refocus the two focal points of the retina.
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