Fernando Faria-Correia1,2,3,4,5,6, Bernardo Lopes7,8, Tiago Monteiro9,10, Nuno Franqueira9, Renato Ambrósio7,8,11,12. 1. Ophthalmology Department, Hospital de Braga, Braga, Portugal. f.faria.correia@gmail.com. 2. Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal. f.faria.correia@gmail.com. 3. ICVS/3B's - PT Government Associate Laboratory, Braga, Portugal. f.faria.correia@gmail.com. 4. ICVS/3B's - PT Government Associate Laboratory, Guimarães, Portugal. f.faria.correia@gmail.com. 5. Rio de Janeiro Corneal Tomography and Biomechanics Study Group, Rio de Janeiro, Brazil. f.faria.correia@gmail.com. 6. , Avenida de Bessa, Edifício Boapor II, 216, 7º Frente, 4100-012, Porto, Portugal. f.faria.correia@gmail.com. 7. Rio de Janeiro Corneal Tomography and Biomechanics Study Group, Rio de Janeiro, Brazil. 8. Instituto de Olhos Renato Ambrósio, Rio de Janeiro, Brazil. 9. Ophthalmology Department, Hospital de Braga, Braga, Portugal. 10. Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal. 11. VisareRio, Rio de Janeiro, Brazil. 12. Department of Ophthalmology and Visual Sciences, Federal University of São Paulo, São Paulo, Brazil.
Abstract
PURPOSE: To assess the correlations between preoperative Scheimpflug-based lens densitometry and effective phacoemulsification time (EPT) in age-related nuclear cataracts. DESIGN: Retrospective consecutive study. METHODS: The setting was the Ophthalmology Department, Hospital de Braga, Portugal. The study population included 50 eyes (42 patients) with age-related nuclear cataracts submitted to uneventful phacoemulsification surgery. Different analysis methods of Scheimpflug-based lens densitometry were performed: Pentacam Nucleus Staging (PNS) score with an ordinal scale from 0 to 5 and three-dimensional (3D), linear and region of interest (ROI) methods, which are displayed on an absolute scale (from 0 to 100%). EPT was calculated for the cataract surgery, which was performed by the same surgeon. Correlations between lens densitometry variables and EPT were determined using Pearson or Spearman correlation coefficients according to data normality. RESULTS: There were significant correlations between EPT and average density and maximum density variables derived from the 3D (r = 0.596, p < 0.001; r = 0.632, p < 0.001, respectively) and ROI (r = 0.527, p < 0.001; r = 0.575, p < 0.001, respectively) methods. The average density was the only parameter derived from the linear analysis that showed a significant correlation with EPT (r = 0.293, p = 0.039). The PNS score did not show a significant correlation with EPT (rho = 0.124, p = 0.390). CONCLUSION: The densitometric parameters based on the 3D method showed the highest correlations with EPT. The referred lens densitometric analysis approach may be used in preoperative assessment in order to predict EPT more efficiently in age-related nuclear cataracts.
PURPOSE: To assess the correlations between preoperative Scheimpflug-based lens densitometry and effective phacoemulsification time (EPT) in age-related nuclear cataracts. DESIGN: Retrospective consecutive study. METHODS: The setting was the Ophthalmology Department, Hospital de Braga, Portugal. The study population included 50 eyes (42 patients) with age-related nuclear cataracts submitted to uneventful phacoemulsification surgery. Different analysis methods of Scheimpflug-based lens densitometry were performed: Pentacam Nucleus Staging (PNS) score with an ordinal scale from 0 to 5 and three-dimensional (3D), linear and region of interest (ROI) methods, which are displayed on an absolute scale (from 0 to 100%). EPT was calculated for the cataract surgery, which was performed by the same surgeon. Correlations between lens densitometry variables and EPT were determined using Pearson or Spearman correlation coefficients according to data normality. RESULTS: There were significant correlations between EPT and average density and maximum density variables derived from the 3D (r = 0.596, p < 0.001; r = 0.632, p < 0.001, respectively) and ROI (r = 0.527, p < 0.001; r = 0.575, p < 0.001, respectively) methods. The average density was the only parameter derived from the linear analysis that showed a significant correlation with EPT (r = 0.293, p = 0.039). The PNS score did not show a significant correlation with EPT (rho = 0.124, p = 0.390). CONCLUSION: The densitometric parameters based on the 3D method showed the highest correlations with EPT. The referred lens densitometric analysis approach may be used in preoperative assessment in order to predict EPT more efficiently in age-related nuclear cataracts.
Authors: Rosa Braga-Mele; David Chang; Steven Dewey; Gary Foster; Bonnie An Henderson; Warren Hill; Richard Hoffman; Brian Little; Nick Mamalis; Thomas Oetting; Donald Serafano; Audrey Talley-Rostov; Abhay Vasavada; Sonia Yoo Journal: J Cataract Refract Surg Date: 2014-02 Impact factor: 3.351