Q3. In 'hyperopia', distant objects look somewhat clear, but close objects appear more blurred. How is this different from presbyopia?

Question

Q3. In 'hyperopia', distant objects look somewhat clear, but close objects appear more blurred. How is this different from presbyopia?

 Q4. Why do we tend to taste the bitterness of an eye drop when putting drops in the eye

 Q5. Do you know that newborn babies are all color-blind? Why do you think this is so? 

Q6. What does it mean by 'blind spot' in our visual field?

Q7. The intensity of sound is measured in units. What is the unit called and state the safe range for normal human hearing

Q8.Can you differentiate the functions of the rods and cones? 

Answer 1

Q3- hyperopia can have similar symptoms to presbyopia. both are different as they are caused by different reasons. hyperopia you are born with due to short eye ball or problems with curvature of lense. presbyopia is age related hardening of lense leading to difficulty in focusing on near objects. so that is the difference between the two.

Q4- tears are drained by lacrimal glands into nose and then they go into throat, back of tongue and pharynx has some taste buds, that is why u taste your eye drops.

Q5- color is perceived by cones, where as light is perceived by rods in retina ( these are specialized receptors in retina). when kids are born their cones are not mature and then they start maturing. hence babies are color blind.

Q6- blind spot is there because it is the spot where optic nerve enter retina. hence there are no rods or cones in that area, hence it is a blind spot. you can test your blind spot by using a red pin and slowly moving infront of one eye while other eye is covered. point where you do not see that red pin head is where your blind spot is.

Q7- sound is measures different ways, since it is a wave form so there is a frequency to it, normal hearing frequency for human ear is 20 to 20 thousand Hz. the loudness or intensity of sound is measured in decibells. normal audible range is 0-180 decibells.

Q8- as i mentioned earlier rods detect light, cones detect colors. so rods are important in dark or dim lit areas and cones are responsible for brightly lit areas.