Tiêu đề Vision Correction.pdf ✅

VISION CORRECTION Prof. Freya Gay A. Jingco, LPT, Ph.D
Common vision defects The need for some type of vision correction is very common. Common vision defects are easy to understand, and some are simple to correct.
two common vision defects ■ Nearsightedness, or myopia, is the inability to see distant objects clearly while close objects are clear. ■ The eye over converges the nearly parallel rays from a distant object, and the rays cross in front of the retina. ■ More divergent rays from a close object are converged on the retina for a clear image. ■ The distance to the farthest object that can be seen clearly is called the far point of the eye (normally infinity).
two common vision defects ■ Farsightedness, or hyperopia, is the inability to see close objects clearly while distant objects may be clear. ■ A farsighted eye does not converge sufficient rays from a close object to make the rays meet on the retina. ■ Less diverging rays from a distant object can be converged for a clear image. ■ The distance to the closest object that can be seen clearly is called the near point of the eye (normally 25 cm).