16
13. Holladay JT, Waring, GO III. Optics and topography of radial keratotomy. In Waring
GO III, editor. Refractive keratotomy for myopia and astigmatism. St. Louis: Mosby,
1992: 37-139.
14. Gullstrand A. Die dioptrik des auges. In: Helmholz HLF von, editor. Handbuch der
physiologischen optik, 3
rd
ed. Hamburg: L Voss. 1909: 41-375.
15. Le Grand Y. Optique physiologique. La dioptrique de l' oeil et sa correction. 2
nd
ed.
Paris: Revue d' Optique. 1965: 147-159.
16. Colliac JP, Shammas, HJ. Optics for photorefractive keratectomy. J. Cataract Refract
Surg 1993; 19: 356-363.
17. Zeh WG, Koch DD. Comparison of contact lens over-refraction and standard
keratometry for measuring corneal curvature in eyes with lenticular opacity.
J. Cataract Refract Surg 1999; 25: 898-903.
18. Holladay JT, Praeger TC, Chandler TY, Musgrove KH. A three-part system for
refining intraocular lens power calculations. J. Cataract Refract Surg 1988; 14: 17-
24.
19. Hoffer KJ. The Hoffer-Q formula: A comparison of theoretic and regression
formulas. J. Cataract Refract Surg 1993; 19: 700-712.
