Refractive changes in nuclear, cortical and posterior subcapsular cataracts. effect of the type and grade.

Autor:	Díez Ajenjo MA; Fundación Oftalmológica del Mediterráneo (FOM), Bifurcación Pío Baroja-General Avilés, s/n, E46015 Valencia, Spain; Clínica Optomètrica, Fundació Lluís Alcanyís, Universitat de València, Guardia Civil, 22, E46020 Valencia, Spain. Electronic address: amparo.diez@uv.es., García Domene MC; Fundación Oftalmológica del Mediterráneo (FOM), Bifurcación Pío Baroja-General Avilés, s/n, E46015 Valencia, Spain., Peris Martínez C; Fundación Oftalmológica del Mediterráneo (FOM), Bifurcación Pío Baroja-General Avilés, s/n, E46015 Valencia, Spain.
Jazyk:	angličtina
Zdroj:	Journal of optometry [J Optom] 2015 Apr-Jun; Vol. 8 (2), pp. 86-92. Date of Electronic Publication: 2014 Sep 02.
DOI:	10.1016/j.optom.2014.07.006
Abstrakt:	Purpose: To determine the effect of main morphological types and grades of age-related cataracts on refractive error. Methods: We measured 276 subjects with optical compensation prior to the development of cataract. We evaluated 224 eyes with nuclear cataract, 125 with cortical cataract, and 103 with posterior subcapsular (PSC) cataract classified with LOCSIII. We measured visual acuity (VA) with their spectacles and best-corrected visual acuity (BCVA) with chart in decimal scale to obtain the optimal compensation with cataract. We evaluated the differences between compensations. Results: A significant myopic shift was observed in nuclear cataract from low to mild grade (p=0.031), the same as for PSC cataract from mild to advanced grade (p=0.025). No significant changes were found for cortical cataract (p=0.462). Regarding astigmatism, we observed power changes in cortical cataract from low to mild grade (p=0.03) and axis changes in PSC from low to mild grade (p=0.02) and in nuclear cataract from mild to advanced grade (p=0.02). Conclusions: Cataract produces changes in patient's compensation which depend on severity and type of cataract. For nuclear and PSC cataract, we observed that the higher the grade of severity, the greater the myopic shift. Power astigmatic changes were found in cortical cataract and axis changes in PSC and nuclear cataract. (Copyright © 2014 Spanish General Council of Optometry. Published by Elsevier Espana. All rights reserved.)
Databáze:	MEDLINE
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