Both too weak and too much light will damage the eyes. As we know, the eyes normal working principle is like that of cameras. When the light comes into our eyes, the image of things we see may come into the front part of the corneal. That is why we see the things clearly. If the light is too weak, it will make the reaction of eye nerves intense. If the light is too strong, it will also make the eyes blurry. If doing this too many times, our eyes may get weak at the reaction to the things outside under the light.
There is no doubt that too much light will damage your eyes. If you read under the bright light for a long time, it can damage the nerve tissue layer, and it will makes the retina bloated or even swell. the ultraviolet waves and the infrared waves which emitted out from the TVs or computers are harm to our eyes. If you have to face the computer when do the work, please relax your eyes and see some green plants. It will help to your eyesight.
Yes, there is no doubt that too much light will cause great harm to the eyes if you work in such an environment for a long time. So far as to we can say that too much light damage the eyes much stronger than weak light. A number of statistics and research proves, too much light, among the light ,blue one can cause macular damage, then forms the macular disease. So, if you go on for a long time, you will be in trouble. Therefore, you should pay attention to developing a good reading habit.