Long-sightedness, Farsightedness, hyperopia or hypermetropia. The Basics.
Long-sightedness. The Basics.
Long-sightedness, Farsightedness, hyperopia or hypermetropia.
A person suffering from Long Sightedness could encounter the following symptoms: -
- Near objects could be blurred or fuzzy yet distant objects remain in good focus
- Tired Eyes
Diagram ‘A’ shows a normal eye where the image is perfectly focused on the Macula Lutea. Suffering from either long-sightedness or short-sightedness would move the point of focus either beyond or before the receiving macula.
When a person is long sighted, they can usually focus on distant objects but not on close up ones (shortsightedness is the opposite where one can focus on near objects but not on distant ones).
Reasons for the cause of long-sightedness could be the shape of the eyeball, the curve of the cornea, the thickness of the lens and muscle control of the lens.
To explain the situation, lets assume that the shape of the eye has altered, becoming shorter from front to back, making the point of focus out of reach (see diagram ‘B’).
Wearing correctly prescribed glasses actually adjusts the image before it reaches the lens of the eye thus bringing the image back into focus (see diagram ‘C’). The glasses will only affect the focus of the image; they will not alter the reversal or transform it in any other way.