ABSTRACT
PURPOSE: To evaluate outcomes of photorefractive keratectomy up to -10.00 D of myopia and -4.50 of astigmatism and to develop a predictive model for the refractive changes in the long term. SETTING: Vissum Corporation and Miguel Hernandez University (Alicante, Spain). DESIGN: Retrospective-prospective observational series of cases. METHODS: This study included 33 eyes of 33 patients aged 46.79±7.04 years (range 40-57) operated with the VISX 20/20 excimer laser with optical zones of 6â mm. No mitomycin C was used in any of these cases. The minimum follow-up was 15â years. The main outcome measures were: uncorrected and corrected distance visual acuity, manifest refraction and corneal topography. Linear regression models were developed from the observed refractive changes over time. RESULTS: Safety and efficacy indexes at 15â years were 1.18 and 0.83, respectively. No statistically significant differences were detected for any keratometric variable during the follow-up (p≥0.103). 15â years after the surgery 54.55% of the eyes were within ±1.00 D of spherical equivalent and 84.85% within ±2.00 D. The uncorrected distance visual acuity at 15â years was 20/25 or better in 60.6% of the eyes and 20/40 or better in 72.73% of the eyes. The correlation between the attempted and the achieved refractions was r=0.948 (p<0.001) at 1â year, and r=0.821 (p<0.001) at 15â years. No corneal ectasia was detected in any case during the follow-up. CONCLUSIONS: Photorefractive keratectomy is a safe refractive procedure in the long term within the range of myopia currently considered suitable for its use, although its efficacy decreases with time, especially, in high myopia. The model developed predicts a myopic regression of 2.00 D at 15â years for an ablation depth of 130â µm.
Subject(s)
Astigmatism/surgery , Lasers, Excimer/therapeutic use , Myopia, Degenerative/surgery , Photorefractive Keratectomy , Refraction, Ocular/physiology , Adult , Astigmatism/physiopathology , Corneal Pachymetry , Female , Follow-Up Studies , Humans , Male , Middle Aged , Models, Biological , Myopia, Degenerative/physiopathology , Prospective Studies , Retrospective Studies , Visual Acuity/physiologyABSTRACT
AIMS: To investigate the visual and refractive outcomes, safety, efficacy and stability of cataract surgery in eyes with stable keratoconus. METHODS: 17 eyes (10 patients) diagnosed as stable keratoconus, aged from 34 to 73 years (56.63 ± 12.47), underwent micro-incision cataract surgery (MICS) followed by implantation of toric intraocular lens (IOL). Seven of them were operated bilaterally and three unilaterally. A complete ophthalmological examination was performed preoperatively and postoperatively. The main outcome measures were: uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), keratometry and manifest refraction. RESULTS: Sphere changed from -1.77 ± 6.57D (-11.00 to 7.00) preoperatively to 0.08 ± 0.79D (-1.25 to 1.75) postoperatively (p=0.211), and cylinder changed from -2.95 ± 1.71D (-7.00 to -0.75) to -1.40 ± 1.13D (-3.25 to 0.00) (p=0.016). UDVA (logMAR) changed from 1.33 ± 0.95 (0.40 to 2.77) to 0.32 ± 0.38 (0.00 to 1.30) (p=0.008) and CDVA (logMAR) changed from 0.32 ± 0.45 (0.01 to 1.77) to 0.20 ± 0.36 (-0.03 to 1.30) (p=0.013). Efficacy and safety indexes were 1.38 ± 0.58 and 1.17 ± 0.66, respectively. Refraction and corneal topography were stable during the follow-up (9.10 ± 5.54 months, 3-15) CONCLUSIONS: MICS surgery using corneal topography data and standard formulas for the calculation of the IOL power is a safe and effective procedure regarding keratometric stability, visual and refractive results.
Subject(s)
Cataract/complications , Keratoconus/complications , Lens Implantation, Intraocular/methods , Lenses, Intraocular , Microsurgery/methods , Phacoemulsification/methods , Refraction, Ocular/physiology , Adult , Aged , Cataract/diagnosis , Corneal Topography , Female , Humans , Keratoconus/diagnosis , Male , Middle Aged , Postoperative Period , Retrospective Studies , Treatment Outcome , Visual Acuity/physiologyABSTRACT
PURPOSE: To evaluate the visual outcomes of patients with a new diffractive trifocal intraocular lens (IOL). METHODS: A trifocal diffractive Fine Vision IOL (Physiol, Liege, Belgium) was implanted after microincision cataract surgery (MICS) in 40 eyes of 20 patients with bilateral cataract. The monocular and binocular visual performance and the refractive status were assessed, as well as the defocus curve and contrast sensitivity at 1 and 6 months postoperatively. RESULTS: The monocular visual outcomes (logMAR) at 6 months postoperatively were uncorrected distance visual acuity 0.18 ± 0.13, uncorrected near visual acuity 0.26 ± 0.15, and uncorrected intermediate visual acuity 0.20 ± 0.11. With the best distance correction, the visual outcomes were 0.05 ± 0.06 for corrected distance visual acuity, 0.16 ± 0.13 for distance corrected near visual acuity, and 0.17 ± 0.09 for distance corrected intermediate visual acuity. Binocular defocus curve at 6 months shows a wide range of useful vision with 0.19 ± 0.08 (logMAR) at -1.50 diopter defocus. The monocular contrast sensitivity under scotopic conditions (3 cd/m(2)) was within normal range for a population older than 60 years. CONCLUSION: The trifocal Fine Vision IOL can restore vision at different distances after cataract surgery, specifically intermediate and near vision.