Non-Orthogonal Corneal Astigmatism among Normal and Keratoconic Brazilian and Chinese populations

References

• Atchison DA, Charman WN. Thomas Young’s contribution to visual optics: the Bakerian Lecture “on the mechanism of the eye”. J Vis. 2010;10(12):16. doi:10.1167/10.12.16.
   PubMed Web of Science ®Google Scholar
• Henderson BA, Gills JP. A complete surgical guide for correcting astigmatism: an ophthalmic manifesto. Thorofare: SLACK; 2011.
   Google Scholar
• Rosenthal JW. Spectacles and Other Vision Aids: a History and Guide to Collecting. Norman Pub; 1996.
   Google Scholar
• Schellini SA, Durkin SR, Hoyama E, Hirai F, Cordeiro R, Casson RJ, Selva D, Padovani CR. Prevalence of refractive errors in a Brazilian population: the Botucatu eye study. Ophthalmic Epidemiol. 2009;16(2):90–97. doi:10.1080/09286580902737524.
   PubMed Web of Science ®Google Scholar
• Liang YB, Wong TY, Sun LP, Tao QS, Wang JJ, Yang XH, Xiong Y, Wang NL, Friedman DS. Refractive errors in a rural chinese adult population: the handan eye study. Ophthalmology. 2009;116(11):2119–27. doi:10.1016/j.ophtha.2009.04.040.
   PubMed Web of Science ®Google Scholar
• Saw SM, Goh PP, Cheng A, Shankar A, Tan DTH, Ellwein LB. Ethnicity-specific prevalences of refractive errors vary in Asian children in neighbouring Malaysia and Singapore. Br J Ophthalmol. 2006;90:1230–35. doi:10.1136/bjo.2006.093450.
   PubMed Web of Science ®Google Scholar
• Read S, Collins M, Carney L. A review of astigmatism and its possible genesis. Clin Exp Optom. 2007;90(1):5. doi:10.1111/j.1444-0938.2007.00112.x.
   PubMed Web of Science ®Google Scholar
• Tong L, Saw SM, Carkeet A, Chan WY, Wu HM, Tan D. Prevalence rates and epidemiological risk factors for astigmatism in Singapore school children. Optom Vis Sci. 2002;79(9):606–13. doi:10.1097/00006324-200209000-00012.
   PubMed Web of Science ®Google Scholar
• Jalie M. The principles of ophthalmic lenses. 5. London, England: Association of Dispensing Opticians; 1972. 478.
   Google Scholar
• Oshika T. Quantitative evaluation of corneal irregular astigmatism and wavefront aberrations. Cornea. 2000;19(3):165–72. doi:10.1097/00003226-200000003-00006.
   Web of Science ®Google Scholar
• Oshika T, Tomidokoro A, Maruo K, Tokunaga T, Miyata N. Quantitative evaluation of irregular astigmatism by Fourier series harmonic analysis of videokeratography data. Invest Ophthalmol Vis Sci. 1998;39(5):705–09.
   PubMed Web of Science ®Google Scholar
• Cavas-Martínez F, De la Cruz Sánchez E, Nieto Martínez J, Fernández Cañavate FJ, Fernández-Pacheco DG. Corneal topography in keratoconus: state of the art. Eye Vis. (London, England). 2016;3:5. doi:10.1186/s40662-016-0036-8.
   PubMedGoogle Scholar
• Mannis MJ, Holland EJ. Cornea E-Book. Netherlands: elsevier Health Sciences. 2016.
   Google Scholar
• Hayashi K, Kawahara S, Manabe S-I, Hirata A. Changes in irregular corneal astigmatism with age in eyes with and without cataract surgery. Invest Ophthalmol Vis Sci. 2015;56(13):7988–98. doi:10.1167/iovs.15-18058.
   PubMed Web of Science ®Google Scholar
• Oshika T, Tomidokoro A, Tsuji H. Regular and irregular refractive powers of the front and back surfaces of the cornea. Exp Eye Res. 1998;67:443–47. doi:10.1006/exer.1998.0558.
   PubMed Web of Science ®Google Scholar
• Valencia-Estrada JC, Malacara-Doblado D. Parastigmatic corneal surfaces. Appl Opt. 2014;53(16):3438–47. doi:10.1364/AO.53.003438.
   PubMed Web of Science ®Google Scholar
• Tummanapalli SS, Potluri H, Vaddavalli PK, Sangwan VS. Efficacy of axial and tangential corneal topography maps in detecting subclinical keratoconus. J Cataract Refract Surg. 2015;41(10):2205–14. doi:10.1016/j.jcrs.2015.10.041.
   PubMed Web of Science ®Google Scholar
• Salmon TO, Horner DG. Comparison of elevation, curvature, and power descriptors for corneal topographic mapping. Optom Vis Sci. 1995;72(11):800–08. doi:10.1097/00006324-199511000-00005.
   PubMed Web of Science ®Google Scholar
• Hickson-Curran S, Brennan NA, Igarashi Y, Young G. Comparative evaluation of Asian and white ocular topography. Optom Vis Sci. 2014;91(12):1396–405. doi:10.1097/OPX.0000000000000413.
   PubMed Web of Science ®Google Scholar
• Hickson-Curran S, Young G, Brennan N, Hunt C. Chinese and Caucasian ocular topography and soft contact lens fit. Clin Exp Optom. 2016;99(2):149–56. doi:10.1111/cxo.12336.
   PubMed Web of Science ®Google Scholar
• Lam CSY, Loran DFC. Designing contact lenses for oriental eyes. Cont Lens Anterior Eye. 1991;14(3):109–14.
   Google Scholar
• Cavas-Martinez F, De la Cruz Sanchez E, Nieto Martinez J, Fernandez Canavate FJ, Fernandez-Pacheco DG. Corneal topography in keratoconus: state of the art. Eye Vis (Lond). 2016;3:1–12.
   PubMedGoogle Scholar
• Olsen T. On the calculation of power from curvature of the cornea. Br J Physiol Opt. 1986;70(2):152–54.
   Google Scholar
• Ho J-D, Tsai C-Y, Tsai RJ-F, Kuo -L-L, Tsai IL, Liou S-W. Validity of the keratometric index: evaluation by the pentacam rotating scheimpflug camera. J Cataract Refract Surg. 2008;34:137–45. doi:10.1016/j.jcrs.2007.09.033.
   PubMed Web of Science ®Google Scholar
• Smit G, Atchison DA. The eye and visual optical instruments. Cambridge, UK: Cambridge University Press; 1970.
   Google Scholar
• Vojnikovi B, Tamajo E. Gullstrand’s optical schematic system of the eye modified by Vojnikovi & Tamajo. Coll Antropol. 2013;37(1):41–45.
   Google Scholar
• Clark VL, Kruse JA. Clinical methods: the history, physical, and laboratory examinations. Jama. 1990;264(21):2808–09. doi:10.1001/jama.1990.03450210108045.
   Google Scholar
• Everitt BS, Skrondal A. The cambridge dictionary of statistics. Cambridge, UK: Cambridge University Press; 2010.
   Google Scholar
• Villegas EA, Alcón E, Artal P. Minimum amount of astigmatism that should be corrected. J Cataract Refract Surg. 2014;40(1):13–19. doi:10.1016/j.jcrs.2013.09.010.
   PubMed Web of Science ®Google Scholar
• Yanoff M, Duker JS, Augsburger JJ. Ophthalmology. China: Mosby Elsevier; 2009.
   Google Scholar
• Heidary G, Ying GS, Maguire MGYoung TL. The Association of astigmatism and spherical refractive error in a high myopia cohort. Optom Vis Sci. 2005; 82(4):244–7.
   PubMed Web of Science ®Google Scholar
• Maeda N, Klyce SD, Tano Y. Detection and classification of mild irregular astigmatism in patients with good visual acuity. Surv Ophthalmol. 1998;43(1):53–58. doi:10.1016/S0039-6257(98)00006-X.
   PubMed Web of Science ®Google Scholar
• Laíns I, Rosa AM, Guerra M, Tavares C, Lobo C, Silva MFL, Quadrado MJ, Murta JN. Irregular astigmatism after corneal transplantation–efficacy and safety of topography-guided treatment. Cornea. 2016;35(1):30–36. doi:10.1097/ICO.0000000000000647.
   PubMed Web of Science ®Google Scholar
• Tanabe T, Tomidokoro A, Samejima T, Miyata K, Sato M, Kaji Y, Oshika T. Corneal regular and irregular astigmatism assessed by Fourier analysis of videokeratography data in normal and pathologic eyes. Ophthalmology. 2004;111:752–57. doi:10.1016/j.ophtha.2003.06.019.
   PubMed Web of Science ®Google Scholar
• Borderie VM, Laroche L. Measurement of irregular astigmatism using semimeridian data from videokeratographs. J Refract Surg. 1996;12(5):595–600.
   PubMed Web of Science ®Google Scholar
• Valencia EJC, Malacara DD. Method for producing parastigmatic surfaces and lenses. Mexico: EP patent; WO2013089548 A3. 2013.
   Google Scholar
• Klein SA. Axial curvature and the skew ray error in corneal topography. Optom Vis Sci. 1997;74(11):931–44. doi:10.1097/00006324-199711000-00027.
   PubMed Web of Science ®Google Scholar
• Hua Y, Zhang X, Utheim TP, Huang J, Pan C, Tan W, Wang Q. Evaluation of equivalent keratometry readings obtained by pentacam HR (High resolution). PLoS ONE. 2016;11(3):1–11. doi:10.1371/journal.pone.0150121.
   Web of Science ®Google Scholar
• Ambrósio R, Guerra FP, Araújo LPN, Khachikian SS, Belin MW, Iwanczuk J, Borasio E, Li S, Ramos ICO, Luz A, et al. Elevation Based Corneal Tomography. 2. Panama: Jaypee - Highlights Medical Publishers, Inc.; 2012.
   Google Scholar
• Oberkampf WL, Roy CJ. Verification and validation in scientific computing. Cambridge, UK: Cambridge University Press; 2010.
   Google Scholar
• Khurana AK. Theory and practice of optics and refraction. Vol. 3, ed: India: elsevier India Pvt. Limited; 2008.
   Google Scholar
• Jogi R. Basic Ophthalmology. 4. New Delhi, India: Jaypee Brothers,Medical Publishers Pvt. Limited; 2008.
   Google Scholar
• Koch DD, Jenkins RB, Weikert MP, Yeu E, Wang L. Correcting astigmatism with toric intraocular lenses: effect of posterior corneal astigmatism. J Cataract Refract Surg. 2013;39(12):1803–09. doi:10.1016/j.jcrs.2013.06.027.
   PubMed Web of Science ®Google Scholar
• Preussner PR, Hoffmann P, Wahl J. Impact of posterior corneal surface on toric intraocular lens (iol) calculation. Curr Eye Res. 2015;40(8):809–14. doi:10.3109/02713683.2014.959708.
   PubMed Web of Science ®Google Scholar
• Schröder S, Eppig T, Langenbucher A. A Concept for the analysis of repeatability and precision of corneal shape measurements. Z Med Phys. 2016;26(2):150–58. doi:10.1016/j.zemedi.2016.01.002.
   PubMed Web of Science ®Google Scholar
• McAlinden C, Khadka J, Pesudovs K. A comprehensive evaluation of the precision (repeatability and reproducibility) of the oculus pentacam HR. Invest Ophthalmol Vis Sci. 2011;52(10):7731–37. doi:10.1167/iovs.10-7093.
   PubMed Web of Science ®Google Scholar
• Zhang B, Ma J-X, Liu D-Y, Guo C-R, Du Y-H, Guo X-J, Cui Y-X. Effects of posterior corneal astigmatism on the accuracy of AcrySof toric intraocular lens astigmatism correction. Int J Ophthalmol. 2016;9(9):1276–82.
   PubMed Web of Science ®Google Scholar