Which of the following is not a defect of vision ?

Correct option is A

Persistence of vision is not a defect of vision but a phenomenon of the human eye that allows the perception of motion in films and animations.

Explanation:
● Persistence of vision occurs when the eye retains an image for a fraction of a second after the object is gone.
● It is the basis for motion pictures and animations.
● Vision defects like presbyopia, myopia, and hypermetropia involve abnormalities in the eye’s ability to focus.
● Myopia refers to nearsightedness, hypermetropia to farsightedness, and presbyopia to age-related difficulty in focusing.
● Corrective lenses or surgeries are used to address these defects.

Information Booster:
● Persistence of vision lasts approximately 1/16th of a second.
● Devices like the zoetrope and modern cinema use this principle.
● Vision defects can result from issues in the cornea, lens, or retina.
● Technological advancements like LASIK surgery offer permanent solutions to some vision defects.
● Eye care and regular checkups are essential for maintaining healthy vision.

Additional Information:

• (b) Presbyopia: Age-related defect causing difficulty in focusing on nearby objects.
• (c) Myopia: Nearsightedness, where distant objects appear blurry.
• (d) Hypermetropia: Farsightedness, where nearby objects appear blurry.