1- Rabinowitz YS. Keratoconus. Surv Ophthalmol 1998;42: 297-319.
2- Krachmer JH, Feder RS, Belin MW. Keratoconus and related non inflammatory corneal thinning disorders. Surv Ophthalmol 1984; 28:293- 322.
3- Kennedy RH, Bourne WM, Dyer JA. A 48-year clinical and epidemiologic study of keratoconus. Am J Ophthalmol 1986; 101:267-73 .
4- Keratoconus: Overview and update on treatment.Middle East African J Ophthalmol 2010; 17(1): 15-20.
5- Edwards M, McGhee CN,DeanS: The genetics of keratoconus . Clin Exp Ophthalmol 2001; 29:345-51.
6- Wachtmeister L, Ingemansson SO, Moller E. Atopy and HLA antigens in patients with keratoconus. Acta Ophthalmol (Copenh) 1982; 60:113-22.
7- Adachi W, Mitsuishi Y, Terai K, et al. The association of HLA with young-onset keratoconus in Japan. Am J Ophthalmol 2002; 133:557- 9 .
8- Wang Y, Rabinowitz YS, Rotter JI, Yang H; Genetic epidemiological study of keratoconus: evidence for major gene determination. Am J Med Genet 2000;93:403-9.
9- Ihalainen A.Clinical and epidemiological features of keratoconus. Genetic and external factors in the pathogenesis of the disease. Acta Ophthalmol (Copenh) 1986; 64(Suppl.): 178.
10- Rahi A, Davies P, Ruben M, et al. Keratoconus and coexisting atopic disease. Br J Ophthalmol 1977;61:761-4.
11- Hashemi H, Mehravaran S . Day to day clinically relevant corneal elevation, thickness, and curvature parameters using the orbscan II scanning slit topographer and the pentacam scheimpflug imaging device. Middle East Aff J Ophthalmol. 2010; 17:44-55.
12- Barkana Y, Gerber Y, Elbaz U, et al. Central corneal thickness measurement with the pentacam Scheimpflug system, optical low-coherence reflectometry pachymeter and ultrasound. J Cataract Refract Surg. 2005; 31(9): 1729-35.
13- Belin M., Ambrósio R., Khachikian S., Salomão M. Keratoconus / Ectasia Detection with the Oculus Pentacam: Belin / Ambrosio Enhanced Ectasia Display. J Highlights of Ophthalmology, 2009; 35 : 5-12.
14- Holladay JT, Hill WE, Steinmueller A. Corneal power measurements using scheimpflug imaging in eyes with prior corneal refractive surgery. J Refract Surg. 2009; 25:862-8.
15- Dumitrica DM and Colin J. Indices for the detection of keratoconus. Ophtalmologia. 2010; 54(2): 19-29.
16- Holladay J., Belin M., Dick B., Ambrosio R.. Why Cataract And Refractive Surgeons Need The Pentacam, J Catract & Refract Surg. 2006; p 1-12.
17- Ambrósio R., Simonato R., Jardim D., Fontes B., Fontes P. Corneal Biomechanics, Pachymetric Progression, and Corneal Volume: Novel Indices for Detecting Ectasia and Screening Refractive Patients. SAN FRANSCICO, ASCRS, 2006; p 1-29.