the human eye , why cant you read in dim light?

Question

what are the reasons

Answer 1

In order to discern print, there needs to be enough contrast between the background and the print. In low light a white page appears gray. In very low light, that gray may register in the rod receptors of the retina as very close to the near-black of the print, making discernment impossible.

Answer 2

It is so because the image is formed with the help of light rays on the retina, but in dim light the amt. of light rays is very less, due to which the imag formed on the retina is blurred, and we are not able to see the image clearly.
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Answer 3

There are 2 kinds of light receptors in the eye, rods and cones. Cones are for normal viewing, they see in color, and are densest around the fovea, the central part of the eye where we do our fine seeing.

Rods do not see color, they only detect the presence or absence of light. They are what let us see well enough at night to navigate. However, they do not see fine gradations in color, and they are relatively more numerous away from the center of the eye.

So, the reason is that reading is done by focusing on the fovea, where the cone cells require more light to read. Night vision is strongest away from the fovea. Sometimes at night you can see clearer by looking out of the corner of your eye than by staring directly at something.

Answer 4

If you had already scrutinise the min part of our eyes, you will find that the pupil is mainly responsible of controlling the amount of light entering the eye. Similarly, our iris, another crucial part of our eye regulates the size of our pupil. So, if you were to read in a dim environment, your pupil will dilate and force as much light to enter your eye and trigger the optic nerve. However, as much as your eye is straining, only a few photoreceptors of light will enter your eye.

Answer 5

there are less light rays that reflect on the book surface to your eyes...