Question

The ideal distance of keeping a book from our eyes when we read is
A. 5-10 cm
B. 10-15 cm
C. 25-30 cm
D. 70-100 cm

Answer 1

Hint: While reading a book an individual should follow a 20-20-20 rule of maintaining the distance that suggests the distance, and amount of time to see at a particular place.

Complete answer:
The eyes are the precious sense organ of our body which requires a proper rest to prevent any damage. The 20-20-20 rule suggests that the person should look away from the book every 20 minutes to the object which is 20 feet away, and look away for at least 20 seconds while maintaining a distance of 25-30 cm.

Additional Information: -The best way to relax the eyes is to take a break after every half hour to reduce the strain and pressure on the eyes.
-If the object which we are reading from is too close to our eyes, then it will increase the pressure on the eyes to focus resulting in muscle stress.
-The eyes detect light and send the information to the brain which sends sensory signals to the eyes for vision.
-Different organisms have different shapes and sizes of the eyes.
-Few animals have a high vision and can see even in the dark of the nights while few can not see properly even in the daylight.
-Around 96% of the animals have more advanced and improved eyes.
-The eyes have retained on which the light falls and it allows the eyes to work.
-The eyes consist of cone cells and rod cells. Cone cells help to see objects during the day while rod cells help to see the objects at night.

So, the correct answer is ’25-30 cm'.

Note: The eyes are of various types depending upon the type and habitat of an organism. The eyes may be simple (non-compound) or compound. Simple eyes are found in most vertebrates, crustaceans, annelids, cephalopods, etc., while the compound eyes are found in arthropods having several photoreceptors.