ABSTRACT
Background The aim of this retrospective study was to evaluate the rotational stability and the refractive outcome of two different toric IOLs. Methods This study included 41 eyes with corneal astigmatism greater than 1.5 diopters (D). All patients underwent surgery in the Department of Ophthalmology at Hietzing Hospital between 2010 and 2013. The study lenses were the Alcon AcrySof IQ Toric IOL and the Abbott Tecnis Toric Aspheric IOL. Measurements of corneal topography and aberrations were performed with the HOYA iTrace™. Determination of visual acuity was performed with ETDRS charts. Optical aberrations were represented by Zernike coefficients, and optical quality was assessed with the Strehl ratio. Results Mean rotation was 4.92° (standard deviation: ± 4.10°) in the Alcon group and 4.31° (± 4.59°) in the Abbott group. No significant difference was observed between the two toric intraocular lenses. Rotational stability was comparable to results from other studies. Astigmatism correction was visualised with a power-vector analysis, which demonstrated similar results in both lenses and a clear success of astigmatism correction. No statistically significant differences were found in residual refractive astigmatism, which was 0.85 ± 0.48 D in the Alcon group and 1.09 ± 0.66 in the Tecnis group. No significant difference between the two groups was found in the Strehl ratio. Conclusion Implantation of toric intraocular lenses (Alcon + Abbott) in patients with regular astigmatism is an effective and safe method, which should be offered to patients. Both the Tecnis and the AcrySof toric IOLs similarly reduced ocular astigmatism.
Subject(s)
Astigmatism/diagnosis , Astigmatism/surgery , Lens Implantation, Intraocular/instrumentation , Lens Implantation, Intraocular/methods , Lenses, Intraocular , Visual Acuity , Aged , Equipment Failure Analysis , Female , Humans , Male , Middle Aged , Prosthesis Design , Treatment OutcomeABSTRACT
PURPOSE: Microperimetry is a useful instrument for evaluating sensitivity threshold due to retinal pathologies. The aim of the study is to assess the impact of different forms of cataract on microperimetry results. METHODS: In a prospective design, patients were recruited for cataract surgery at the Department of Ophthalmology, Medical University of Vienna. Exclusion criteria were any other ophthalmic disease except cataract, that is, macular pathology. Using the Lens Opacities Classification System III classification, patients were classified into four groups: nuclear, cortical, subcapsular posterior, and mixed cataract. Then patients underwent microperimetry: results were analyzed for magnitude of retinal sensitivity loss and correlated to the forms and density of the cataract. RESULTS: Mean density of cataract was LOCS 3.2-3.5 in the four groups. Differences were not statistically significant. The best-corrected visual acuity (BCVA) was LogMAR 0.5 ± 0.13 in nuclear, LogMAR 0.49 ± 0.21 in cortical, and LogMAR 0.58 ± 0.12 in mixed cataract patients, and significantly worse in patients with subcapsular posterior cataract (LogMAR 0.64 ± 0.12). Microperimetry shows a mean sensitivity of 11.4-12.6 dB without significant group differences. The BCVA is correlated with microperimetry in patients with nuclear and cortical cataract. Density of cataract is highly correlated with microperimetry results in all groups. CONCLUSION: The present study shows a good correlation of microperimetry results with the BCVA of patients with nuclear and cortical cataract. In patients with subcapsular posterior cataract, microperimetry results were better than estimated by BCVA. Density of cataract is highly correlated with macular sensitivity. A reduction of 1 dB in microperimetry per 1 posterior capsule opacification score increase can be estimated for these patients.
Subject(s)
Aging , Cataract/pathology , Lens Nucleus, Crystalline/pathology , Visual Acuity , Visual Field Tests , Aged , Cataract/classification , Cataract/physiopathology , Contrast Sensitivity , Female , Humans , Male , Prospective Studies , Sensitivity and Specificity , Severity of Illness Index , Visual Field Tests/standardsABSTRACT
PURPOSE: To evaluate the interexaminer and intraexaminer reliability of macular microperimetry using the microperimeter MP-1. METHODS PARTICIPANTS: Fifteen healthy volunteers younger than 40 years of age (Group 1), 15 healthy subjects over 60 years (Group 2), and five patients with age-related macular degeneration (Group 3). OBSERVATION PROCEDURE: Two examiners (E1 and E2) measured, in random order, interexaminer (E2-E1a) reliability. Another examination was undergone by one of the examiners a week later to evaluate the intraexaminer (E1b-E1a) reliability. MAIN OUTCOME MEASURES: Macular sensitivity (mean threshold (decibel)) and stability of fixation were determined using MP1 microperimetry. Agreement was analysed by means of Bland-Altman plots and by the determination of the intraclass correlation coefficient.ResultsThe interexaminer (E2-E1a) and the intraexaminer (E1b-E1a) differences in the mean threshold values were not statistically significant (P=0.850, 95% confidence Interval (CI)=-0.265 to 0.319; P=0.246, 95% CI=-0.099 to 0.375, respectively). Limits of agreement and intraclass correlation coefficients also showed good agreement in each group. CONCLUSIONS: A good reliability was found for the mean threshold values in all the three groups, indicating examiner-independent measurements.
Subject(s)
Fixation, Ocular/physiology , Macular Degeneration/physiopathology , Retina/physiology , Visual Field Tests/instrumentation , Visual Fields/physiology , Aged , Aged, 80 and over , Analysis of Variance , Female , Humans , Male , Middle Aged , Observer Variation , Visual Acuity/physiology , Visual Field Tests/methodsABSTRACT
BACKGROUND: Lengthy waiting times are linked to a decline in visual acuity and quality of life. The aim of our study was to evaluate patients' maximum acceptable waiting time (MAWT). PATIENTS AND METHODS: A total of 300 consecutive cataract patients were asked to fill out a questionnaire. The main question addressed the patient's MAWT to undergo cataract surgery. Patients' visual impairment (VF-14 score), best corrected visual acuity (BCVA), education, profession, and social status were evaluated. RESULTS: The mean MAWT was 3.25+/-2.3 months. A significant correlation between VF-14 score and MAWT (r=0.241, p=0.001) and between MAWT and BCVA (r=0.187, p=0.01) was found. Well-educated patients (4.30+/-2.53 months, p=0.004) and patients living with a partner (3.62+/-2.41 months, p= 0.031) were more likely to tolerate longer MAWT. Patients living alone (2.94+/-2.21 months, p= 0.107) and patients who had to take care of a nursing case (2.83+/-1.90 months, p=0.589) tended to shorter MAWT. CONCLUSIONS: MAWT is dependent on subjective visual impairment and objective BCVA. Availability of social services was also a strong predictor from the patients' perspective.
