Reading problems are issues that can affect a person's ability to read and comprehend written material. Dyslexia is a common reading problem, which is characterized by difficulty with word recognition, spelling, and decoding. Eyestrain is another reading problem, which is caused by prolonged use of the eyes for activities such as reading, writing, or using a computer. Both dyslexia and eyestrain can lead to difficulty in understanding written material, and can be addressed through specialized instruction and/or vision therapy.