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Refractive results of cataract surgery using optical biometry and Haigis formula in eyes with refractive keratotomy105Table 2Average preoperative keratometry32.50 to 34.00 1 5%34.25 to 36.00 7 35%36.25 to 38.00 7 35%38.25 to 40.00 1 5%40.25 to 42.00 2 10%42.25 to 44.00 2 10%Total 20 100%Table 3Postoperative refraction (spheric equivalent)Plano 8 40%+0.50 a -0.50 7 35%-0.75 a -1.00 2 10%> -1.00 3 15%Total 20 100%Table 4Preoperative refraction and preoperative spheric equivalent,postoperative refraction and postoperative sphericequivalentNº RX Pre S.E. Pre RX Post S.E. Post1. -0.50 -1.75 70º -1.37 +0.50 -2.50 90º -0.752. +1.50 +1.50 Plano Plano3. +1.50 +1.50 Plano Plano4. +2.75 -0.50 30 +2.50 -1.75 140º -0.875. +4.00 -1.00 180 +3.50 -0.50 160º -0.256. +0.50 +0.50 +0.50 +0.507. +2.00 -5.00 135º -0.50 -5.00 120º -2.508. +1.50 -1.00 85º +1.00 -1.00 115º -0.509. -1.00 145º -0.50 Plano -5.50 105º -2.7510. -1.00 -4.00 90º -3.00 +1.00 -4.50 92º -1.2511. -4.00 -2.00 35º -5.00 +0.50 -1.50 15º -0.2512. -1.00 80º -0.50 +0.50 -0.75 105º +0.2513. +1.00 -0.50 90º +0.75 Plano Plano14. +2.00 +2.00 Plano Plano15. -4.75 -0.75 180º -5.12 Plano Plano16. -2.00 -0.50 45º -2.25 -1.00 145º -0.5017. -0.50 70º -0.25 +0.50 -0.50 70º +0.2518. +1.50 -0.25 50º +1.38 Plano Plano19. +3.50 +3.50 Plano Plano20. +3.00 -1.00 110º +2.50 -1.00 120º -0.50Table 5Postoperative UDVA20/20 3 15%20/30 6 30%20/40 4 20%20/50 2 10%20/60 2 10%20/100 1 5%20/200 2 10%Total 20 100%Table 6Postoperative CDVA20/20 13 65%20/30 5 25%20/40 2 10%Total 20 100%RESULTSTable 1 shows the relationship of the eyes studied with thefollowing data: preoperative keratometry, axial length, anteriorchamber depth (ACD), implanted IOL, postoperative refraction,spherical equivalent (SE), postoperative visual acuity with andwithout correction and formula used.Preoperative keratometry varied from 32.50 D to 43.63 D(Table 2).Axial length varied from 23.00mm to 29.38mm (Figure 1).Average spheric equivalent in postoperative refraction wasplano in 40% of the eyes and lower than -1.00 in 85% of theeyes (Table 3).Figure 1: Axial lengthStatistical analysisApplying the T test in relation to a previously plannedrefraction, if it is plano = 0, one obtains statistical t = 2.3941 withp = 0.02714 which means that the mean random variable of postsurgicalspheric equivalent is statistically different from zero.The uncorrected distance visual acuity is shown in table 5.Postoperative CDVA is shown in table 6.Rev Bras Oftalmol. 2013; 72 (2): 103-7