Which ratio of areas improves vision quality in simultaneous focus optics?

Optometry and Vision Science : Official Publication of the American Academy of Optometry
David Rio, Richard Legras

Abstract

To evaluate the impact of the center optical zone diameter (COZD) of center-near bifocal optics on the through-focus subjective quality of vision. Subjective image quality was assessed by 14 young, normally sighted subjects. Computed images of three high-contrast 20/50 letters were generated, across a range of object vergences from +2 diopters (D) to -4 D in 0.25-D steps. The center near optical zone addition power was +2.50 D, and the diameter of this center zone was varied in 10% steps to cover from 0% (single vision distance) to 90% of the 4.5-mm pupil diameter. Subjects rated image clarity of these computed images on a 0 to 5 scale, through a 3-mm pupil to limit the effect of their own aberrations. To quantify the efficiency of bifocal optics, we calculated the area under the through-focus subjective quality of vision curve. A criterion higher than 2 was judged to be an acceptable level of quality of vision, normalized by the naked eye condition. The average benefit of the optical profiles is highly subject dependent (i.e., from 0.8 to 1.9), potentially explaining why some subjects are not satisfied with simultaneous vision multifocal corrections. Averaged across subjects, the best benefit (i.e., 1.42) was obtained with a C...Continue Reading

References

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Citations

May 20, 2016·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·David RioRichard Legras
Jan 11, 2019·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Miguel Faria-Ribeiro, José M González-Méijome
Apr 3, 2019·Journal of Cataract and Refractive Surgery·Renfeng XuArthur Bradley
Oct 27, 2016·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Miguel Faria-RibeiroJosé Manuel González-Méijome
Apr 26, 2017·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Richard Legras, David Rio
Jan 3, 2020·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Marc VincentRichard Legras
Jan 5, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Marc VincentRichard Legras
Apr 6, 2021·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·C Talens-EstarellesS García-Lázaro

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