Dry eyes can cause discomfort in the eyes when reading, watching movies or TV and using a computer. Usually its both eyes. This can often be helped by using artificial tears before a session on the computer and each 10-15 minutes look away from the screen across the room and blind 4-5 times.
I also suggest you see a eye physician (Eye MD or Ophthalmologist) for a comprehensive medical eye examination. It will be more thorough and in depth than the exam from the non-physician, limited scope eye care practitioner (optometrist).
JCH III MD Eye MD