Those with a null point will often adopt a head posture to make best use of their vision. Sitting to one side of a screen, blackboard, etc. does not help because it reduces the angle at which the screen is viewed, causing 'crowding'. Many can read very small print if it is close enough or with use of a visual aid. However, the option of large print material should be available and all written matter should be clear. It isvery hard to share a book with someone because it will probably be too far away or at the wrong angle.
Good lighting is important.
If in doubt get the advice of a specialist, particularly as some people are also light sensitive. Computers are used by many people with nystagmus, who benefit from them as they can position screens to suit their own needs and adjust brightness, character size etc. However some find it difficult to read computer screens. Reading speed is not usually reduced by nystagmus itself, but by other associated visual deficits. CN should not be taken as a predictor of poor reading.