1. VERTICAL PRISM ADAPTATION IN ANISOMETROPES
2. C. Curry (1962 ) Geometric Optics , pp.48 -52 . Edward Arnold, London..
3. M. Jalie (1984 ) The Principles of Ophthalmic Lenses , 4th edn. (a) pp.315 -320 ; (b) pp.315 -320 ; (c) pp.315 -320 ; (d) p.315 .The association of dispensing opticians, London..