Yes, too much continuous reading without taking a rest is very bad for your eyes as well as for other parts of you body like the neck, back and so on. When you are reading too much, the muscles of the eyesare under a tense condition and have been working for a long time without relaxation, which will cause the eye fatigue and eye muscle soreness, thus you may feel pain in your eyes. In addition, long time of reading without any break or rest will cause the insufficient blood supply in the brain, which will also lead to the insufficiency of blood in your eyes, making you feel blurry vision and eye fatigue. Besides, reading too much will also easily lead to poor eyesight and you may gradually get nearsightedness. If you feel that you cannot see things nearby clearly, you should go to the doctor's to take an eye examination to see if you get myopia or not. If you get nearsightedness, you should wear a pair of eyeglasses with the right prescription and pay attention to allow your eyes to have adequate rest. Do some exercises regularly. Do not use your eyes too much. Eat more vegetables, fruits, and milk, eggs, and so on to supplement nutrition to your eyes.