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First Author: N.Burguera-Giménez SPAIN
Co Author(s): A. Domínguez-Vicens A. Del Águila-Carrasco V. Sanchis-Jurado R. Montés-Micó
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To evaluate the influence of the multifocal optical design (MF) in quality of vision by means of Visual Acuity (AV), Contrast sensitivity function (CSF) and defocus curve (DC).
University of Valencia, Spain
A longitudinal, prospective analysis of 14 consecutive presbyopic eyes of seven patients were analyzed binocularly with Multifocal Lenses. In order to asses which optical design would improve the visual performance, two differents contact lens designs are randomly combined four times, a dominant design D (centre-distance) and non-dominant design N (centre-near) over dominant and non-dominant eye. After thirty minuts, binocular distance visual acuity (BDVA), binocular near visual acuity (BNVA), CSF and defocus curve were performed under fotopic (85 cd/m2) and mesopic conditions (3 cd/m2) by means of the Functional Acuity Contrast Test.
Better values of BDVA were obtained for "DD" (dominant design in either eye), -0.042 ±0.13 logMAR, than "NN" (non-dominant design in both eyes) 0.082 ±0.13 logMAR (P= 0.05). BNVA was -0.047±0.16 logMAR for NN and 0.003 ±0.13 logMAR for ND (non-dominant design in dominant eye and dominant design in non-dominant eye)(P> 0.05). DN (dominant design in dominant eye and non-dominant design in non-dominant eye) reports an acceptable BDVA 0.016±0.16 logMAR and better BNVA -0.015ḟ0.15 logMAR. Under Photopic and binocular conditions, a statistical significant decrease in CSF was found (P< 0.05) at low frequency (1.5 cpg) between DD and ND versus DN. Under mesopic conditions, a reduction at high spatial frequency (18 cpg) in all CL designs was found being significant under binocular conditions (P < 0.05).
Multifocal Lens provided different visual performance at distance and near depending on the lens design. Under photopic conditions all combinations provided adequate CSF, however, under mesopic conditions a decrease in visual quality can be expected at all spatial frequencies. Centre-distance design provide better visual performance at distance, however centre-near seems to be more effective at near distance.