Sentence:  Assume that the receptors are aligned with a point on the nasal side of the pupil, (a) For an <WSD>under-accommodated</WSD> image, light rays on the nasal side are better aligned with receptors than those on the temporal side, (b) For an over-accommodated image, temporal light rays are better aligned with receptors than nasal rays. 
Meaning of the word marked with <WSD> tags:  Involving a focal point that falls short of the retina.