Question

Ishihara charts are used by ophthalmologists for detecting
A. Eye infection
B. Night blindness
C. Colour blindness
D. Fingerprints

Answer 1

Hint: Ophthalmologists are known as eye specialists. Ishihara charts are dotted charts with some hidden numbers in them.

Complete Answer:
Eyes are the most sensitive part of the body which helps us to see the beautiful world around us. If not taken care properly can lead to blindness. There are many factors involved in causing damage to eyes.
1) Eye infections can be caused by various factors like touching eyes by dirty hands, not cleaning eyes on a regular basis or can be caused by various microorganisms.
2) Bad eating habits can also lead to weak eyesight. Like deficiency of Vit A causes night blindness. A person with night blindness cannot see in dim light.
3) Color blindness is a genetic disorder. There are two types of cells found in the retina, Rods and cones. Rods are responsible for vision in the dim light whereas cones are responsible for color vision. Due to malfunctioning for certain genes in cone cells the person faces difficulty in identifying colors and hence is called color blind.
4) Fingerprinting is a technique used to identify the criminals. Each individual holds his/her unique fingerprints which no other person can have. Now-a-days finger sensors are used to mark the attendance at various organizations.

The correct Answer is, “C” since Ishihara charts are used by Ophthalmologists to identify the color blindness disorder.

Note: Ishihara charts contain various hidden numbers which need to be identified. Color blind person fails to identify these numbers.