Which Ratio of Areas Improves Vision Quality in Simultaneous Focus Optics?

Abstract

Quality of vision with bifocal optics is highly subject dependent. Peripheral rays do not seem to play an important role in the through-focus quality of vision, as the central pupil area is more heavily weighted in determining subjective image quality.

Effect of Number of Zones on Subjective Vision in Concentric Bifocal Optics

“…2) the average through-focus image quality score for the twoYconcentric zone profile obtained in this and a previously published experiment. 8 The average absolute difference between the two curves is 0.12 (G3%). Fig.…”

“…2), confirming our previous results. 8 The benefit of viewing through an optical profile is highly subject dependent as shown by the observed variation in AUC from 0.54 to 2.37. Some subjects did not experience any improvement irrespective of profile whereas some others rated their distance and near vision highly with all profiles, except for the 20Yconcentric zone profile.…”

“…This result had already been observed with various radiuses of the center part of two-zone bifocal optics. 8 We previously tested the impact of a twoYconcentric zone bifocal optic using the same methodology on 14 subjects. 8 Fig.…”

“…8 We previously tested the impact of a twoYconcentric zone bifocal optic using the same methodology on 14 subjects. 8 Fig. 2 shows the average through-focus curves obtained in both studies with the twoYconcentric zone profiles and the naked eye.…”

“…This gradation method has already been used in previous experiments. 8,16,17 The images were displayed on a LED (light-emitting diode) backlit display that was linearized using a Topcon BM3 luminance meter. The mean luminance of the display was 100 cd/m 2 .…”