Question

3
What would be the pupil size and lens shape of a person reading a mobile phone text message in
a brightly-lit room?​

Answer 1

Answer:

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The first thing that happens when you enter a bright space after being in the dark is you (probably) squint. This is a semi-involuntary contraction of the eyelids and surrounding muscles that reduces the amount of light entering by partly shading the pupils.

The next thing is that the pupils of your eyes contract, with the same effect of reducing the amount of light entering.

The third thing is that certain chemicals in the retinas of your eyes are reduced in concentration, and other chemicals increase in concentration. The net effect of this is that your eyes become a lot less sensitive to light, which is good if you are in a bright place.

There are probably a lot more things that happen. To learn more I suggest a web search on "bright light adaptation of human eyes" or something similar.

Or you could wait for someone who knows more about eye physiology to provide a more detailed answer!

Answer 2

Explanation:

The first thing that happens when you enter a bright space after being in the dark is you (probably) squint. This is a semi-involuntary contraction of the eyelids and surrounding muscles that reduces the amount of light entering by partly shading the pupils.

The next thing is that the pupils of your eyes contract, with the same effect of reducing the amount of light entering.

The third thing is that certain chemicals in the retinas of your eyes are reduced in concentration, and other chemicals increase in concentration. The net effect of this is that your eyes become a lot less sensitive to light, which is good if you are in a bright place.

There are probably a lot more things that happen. To learn more I suggest a web search on "bright light adaptation of human eyes" or something similar.