According to Helmholtz it is nowadays accepted that one of the major reasons for the development of presbyopia is the increasing sclerosis of the crystalline lens. Therefore the investigation of the process of accommodation of the lens is an important field of research. Our aim was to simulate the process of accommodation in-vitro and to measure the changes of geometry of the crystalline lens m...

The dynamic accommodation responses to small, abrupt changes in an accommodation stimulus were studied in two experiments. In the first, responses of 19 subjects with ages distributed between 18 and 49 years were measured for step stimuli of +/- 1.05 D. In the second, responses to small step stimuli (+/- 0.75, +/- 1.75 D) were recorded for a group of six 'young' (mean age 22, range 16-26 years)...

S. Bará Area de Optica, E.U., Optica e Optometria, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, GALIZA Spain A. Ciro López Grupo de Optica y Fotonica, Instituto de Fisica, Universidad de Antioquia, A.A1226, Medellin, Colombia Facultad de Ciencias, Instituto Tecnologico Metropolitano, calle 73 #76A-354, Medellin, Colombia Z. Jaroszewicz [email protected] Institute ...

BACKGROUND The use of plus lenses to compensate for the reduction in the range of accommodation associated with presbyopia, brings the near point of accommodation to a comfortable distance for near visual tasks. Our aim was to compare the tentative near addition determined using the most common procedures with the final addition prescribed in presbyopic patients. METHODS Sixty-nine healthy su...

Title: Measuring benefits and patients' satisfaction when glasses are not needed after cataract and presbyopia surgery: scoring and psychometric validation of the Freedom from Glasses Value Scale (FGVS(c)) Authors: Gilles Berdeaux ([email protected]) Juliette Meunier ([email protected]) Benoit Arnould ([email protected]) Muriel Viala-Danten (muriel.viala@ma...

PURPOSE To define the corneal optics of conductive keratoplasty (CK) and assess the clinical implications for hyperopia and presbyopia management. METHODS Four analyses were done. (1) Multifocal effects: In a prospective study of CK, uncorrected visual acuity (UCVA) for a given refractive error in 72 postoperative eyes was compared to control eyes. (2) Surgically induced astigmatism (SIA): 20...