- accommodation, 1, 2, 3, 4, 5, 6, 7
- accommodation drills, 1, 2, 3
- acquired defects, 1, 2
- after-images, 1
- Alexander Technique, 1
- alpha waves, 1
- alphabet, 1, 2
- aqueous, 1, 2, 3, 4
- area striata, 1, 2
- Art of Seeing, The (Aldous Huxley), 1, 2
- association fibres, 1
- astigmatism, 1, 2, 3, 4, 5, 6, 7, 8, 9
- astigmatism indicator, 1
- attention, 1
- attitudes to seeing, 1, 2, 3, 4