Qstnid -25- Does Short-sightedness (Myopia) Or Long-sightedness (Hypermetropia) Imply Necessarily That The Eye Has Partially Lost Its Ability Of Accommodation? If Not, What Might Cause These Defects Of Vision? - 09: Ray Optics And Optical Instruments

II - page 3

#25
Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?

Ans : A myopic or hypermetropic person can also possess the normal ability of accommodation of the eye-lens. Myopia occurs when the eye-balls get elongated from front to back. Hypermetropia occurs when the eye-balls get shortened. When the eye-lens loses its ability of accommodation, the defect is called presbyopia.