How to know the power of spectacle for Farsightedness or Hyperopia
Farsightedness is a defect of the eye also known as Hyperopia or Hypermetropia. In this defect, the person can see the far objects clearly but cannot see the near objects due to the short of eye-ball and image formed at behind the retina, not on the retina. we need a Convex lens to remove this defect.
If a person can see the objects up to d distance of near point clearly in front of the eye then to calculate the power of the spectacle is
where D=25 cm (Least distance of distinct vision)
Positive of power means a convex lens.
Farsightedness is corrected with glasses or contact lenses to alter the means lightweight rays bend into the eyes.
If your glasses or lens system prescription begins with and numbers, like +2.50, you’re farsighted.
You may have to be compelled to wear your glasses or contacts all the time or only if reading, acting on a pc or doing different close-up work.