Defects of Vision
Physics ⇒ Light and Optics
Defects of Vision starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Defects of Vision.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 9
A person can see objects clearly only when they are between 50 cm and 2 m from the eye. What type of vision defect does the person have?
A person is unable to read a book held at normal reading distance but can see distant objects clearly. What defect does the person have?
A person with a near point of 50 cm wants to read a book at 25 cm. What type of lens should be used?
A person with astigmatism sees vertical lines clearly but horizontal lines are blurred. What type of lens should be used to correct this?
A person can see objects clearly only when they are between 50 cm and 2 m from the eye. What type of vision defect does the person have?
A person is unable to read a book held at normal reading distance but can see distant objects clearly. What defect does the person have?
A person with a near point of 50 cm wants to read a book at 25 cm. What type of lens should be used?
A person with astigmatism sees vertical lines clearly but horizontal lines are blurred. What type of lens should be used to correct this?
Which defect of vision is commonly found in elderly people? (1) Myopia (2) Hypermetropia (3) Presbyopia (4) Astigmatism
Which lens is used to correct hypermetropia? (1) Concave lens (2) Convex lens (3) Cylindrical lens (4) Bifocal lens
Which of the following is a cause of hypermetropia? (1) Shortening of the eyeball (2) Elongation of the eyeball (3) Excessive curvature of the lens (4) Irregular cornea
Which of the following is a symptom of hypermetropia? (1) Blurred vision for distant objects (2) Blurred vision for near objects (3) Double vision (4) Night blindness
Astigmatism is corrected by using ________ lenses.
The defect of vision in which a person cannot see nearby objects clearly is called __________.
The defect of vision in which the eye cannot focus light evenly on the retina is called ________.
The defect of vision in which the lens becomes cloudy and impairs vision is called ________.
True or False: A convex lens is thicker at the edges than at the center.
True or False: Astigmatism can be caused by an irregularly shaped cornea.
True or False: Hypermetropia can be corrected by using a concave lens.
True or False: Myopia can be corrected by using a convex lens.
