Abstract
Purpose :
Peripheral optics has been suggested to play a role in myopia progression and some of the current myopia control approaches are based on peripheral defocus control. Accommodation response is also considered a potential contributing to myopia progression. In this work, we wanted to explore if modifications in the peripheral optics may affect or not the accommodation response.
Methods :
A double-pass prototype instrument was used to assess dynamic accommodation response and retinal image quality in 13 adults (average age 28 years old). The instrument consists of an infrared laser that produces a retinal point-like spot, a tunable lens capable of inducing −10 D to +10 D of defocus, and a CMOS camera for acquiring retinal images. Real-time accommodation responses, pupil size and image quality data are recorded. The subjects were instructed to fixate on a Maltese cross at far (3 m), near (0.22m/4.5D), and far again for 3s, 5s, and 3s respectively. Three commercially available myopia control glasses were tested for viewing through their central clear zones (CCZ) and the peripheral side-vision zones (PSVZ) decentered 1.5 cm. The glasses are MiYOSMART (Hoya), Stellest (Essilor), and MyoCare (ZEISS). Single vision glasses (SV) were used as a reference.
Results :
The lag of accommodation was less than 0.5D for constant near stimulation (4.5D) for all cases. No difference on accommodation responses among myopia control glasses were observed. The average response [M±SE, in diopters] through the: SV, CCZ of MiYOSMART, PSVZ of MiYOSMART, CCZ of Stellest, PSVZ of Stellest, CCZ of MyoCare, PSVZ of MyoCare were -0.3±0.1, -0.2±0.2, -0.3±0.2, -0.2±0.2, -0.2±0.2, -0.2±0.2, -0.4±0.2, respectively, for distance vision; and -4±0.2, -4±0.2, -4.1±0.2, -4.1±0.2, -4.2±0.2, -4±0.2, -4±0.1, respectively, for the near target. The image quality through the PSVZ of Stellest and MyoCare was significantly worse than the other lenses. The image quality through the PSVZ of MiYOSMART was ranked between the quality produced by PSVZ of Stellest/MyoCare lenses and the CCZ of all lenses.
Conclusions :
No effect in the accommodation response through the optics of different types of myopia control lenses was found. This indicates that the induced changes in the ocular peripheral optics do not have an effect on accommodation. These findings are relevant to gain a deeper understanding of the underlying working mechanisms of these spectacle lenses.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.