PURPOSE: To describe prevalence and associations of asymmetric refraction in an older population. METHODS: All participants in the Blue Mountains Eye Study had comprehensive eye examinations, including refraction. Spherical equivalent (SEq = sum sphere +.5 cylinder), in diopters, defined refractive error. Refractive asymmetry was assessed in phakic participants; anisometropia was defined as > or =1.0 diopters SEq difference between eyes. RESULTS: Anisometropia was present in 14.7% of participants. Mean refractive asymmetry (in diopters) in persons aged <60 years was 0.43; 60 to 69 years, 0.51; 70 to 79 years, 0.72; and 80+ years, 0.88. Prevalence and severity of anisometropia increased with age (P <.001), increasing ametropia or astigmatism. Associations included older age, cataract, and increasing ametropia. Myopic participants >-3.0 diopters had the highest anisometropia prevalence. CONCLUSIONS: Refractive asymmetry was associated with age, increasing ametropia, and cataract.
PURPOSE: To describe prevalence and associations of asymmetric refraction in an older population. METHODS: All participants in the Blue Mountains Eye Study had comprehensive eye examinations, including refraction. Spherical equivalent (SEq = sum sphere +.5 cylinder), in diopters, defined refractive error. Refractive asymmetry was assessed in phakic participants; anisometropia was defined as > or =1.0 diopters SEq difference between eyes. RESULTS: Anisometropia was present in 14.7% of participants. Mean refractive asymmetry (in diopters) in persons aged <60 years was 0.43; 60 to 69 years, 0.51; 70 to 79 years, 0.72; and 80+ years, 0.88. Prevalence and severity of anisometropia increased with age (P <.001), increasing ametropia or astigmatism. Associations included older age, cataract, and increasing ametropia. Myopic participants >-3.0 diopters had the highest anisometropia prevalence. CONCLUSIONS: Refractive asymmetry was associated with age, increasing ametropia, and cataract.
Authors: Li Deng; Jane Gwiazda; Ruth E Manny; Mitchell Scheiman; Erik Weissberg; Karen D Fern; Katherine Weise Journal: Invest Ophthalmol Vis Sci Date: 2014-04-03 Impact factor: 4.799
Authors: Gunilla Haegerstrom-Portnoy; Marilyn E Schneck; Lori A Lott; Susan E Hewlett; John A Brabyn Journal: Optom Vis Sci Date: 2014-01 Impact factor: 1.973