Jay B
Trans Ophthalmol Soc U K (1962). 1978;98(2):309-12.
Prevention of blindness from retinitis pigmentosa is considered in three stages: what can be done at present; what is likely to be achieved within the next few years; and what can be envisaged for the more distant future.
目前能做的事情；未来几年可能实现的目标；以及更长远未来可设想的目标。
