Ophthalmol open BMJ. 2022 Apr 5;7(1):e000971. doi: 10.1136/bmjophth-2022-000971. eCollection 2022.
OBJECTIVE: The visual performance and short-term tolerability of different designs of myopia correction options, including therapeutically relevant bifocal (CL) contact lenses and spectacle lenses with “multiple-incorporated defocus” technology. segments (DIMS)”, were compared.
METHODS AND ANALYSIS: In myopic volunteers (n=8; spherical equivalent range: -1 to -7 D), visual acuity (VA) using Landolt C and contrast sensitivity (SC) using contrast C were evaluated at three different gaze positions (-22° nasal, +22° temporal and 0° central), corresponding to gaze through the DIMS zone or clear zone of the lens design DIMS, respectively, after short-term wear of each of single vision (SV) spectacle lenses, DIMS spectacle lenses (DIMS), CL soft monofocal and CL soft multifocal near center (MCL). Additionally, CS was evaluated under photopic and mesopic light conditions with and without glare using sinusoidal gratings at 1.5, 3, 6, 12, and 18 cpd.
RESULTS: Mean VA (Landolt C) was -0.12 to -0.10, -0.05 and 0.10 logMAR (SV, DIMS, CL, MCL) at central gaze (0°). At nasal gaze (-22°), VA differed by 0.12, 0.33, 0.05 and 0.01, and at temporal gaze (+22°) by 0.05, 0.26, 0 and -0.08 compared to the values of the central gaze. Mean CS (contrast C) was 1.74, 1.73, 1.69 and 1.61 logCS (SV, DIMS, CL, MCL) at central gaze at nasal gaze, CS differed from -0.02 to -0.13, -0.01 and -0.01, and at the temporal gaze from -0.02 to -0.16, -0.01 and +0.06 compared to the values of the central gaze.
CONCLUSION: Compared to SV, MCL leads to a general decrease in VA and CS, while DIMS did not differ from SV at right gaze (0° gaze). With DIMS, VA and CS are decreased to a level similar to that of MCL, but only at the nasal and temporal gaze.