One-year myopia control Efficacy of Spectacle lenses with as
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A Study was conducted to evaluate the 1-year efficacy of two new myopia control spectacle lenses with lenslets of different asphericity.

Spectacle lenses with extremely aspherical lenslets (HAL), slightly aspherical lenslets (SAL), or single-vision spectacle lenses were issued to 170 schoolchildren aged 8–13 years with myopia ranging from 0.75 D to 4.75 D. (SVL). At baseline and at 6-month intervals, cycloplegic autorefraction (spherical equivalent refraction (SER)), axial length (AL), and best-corrected visual acuity (BCVA) were measured. During each visit, questionnaires on adaptation and enforcement were given out.

Results:
--After 1 year, the mean changes in the SER (±SE) and AL (±SE) in the SVL group were -0.81±0.06 D and 0.36±0.02 mm.

--Compared with SVL, the myopia control efficacy measured using SER was 67% for HAL and 41% for SAL, and the efficacy measured using AL was 64% for HAL and 31% for SAL.

--HAL resulted in significantly greater myopia control than SAL for SER (difference of 0.21 D) and AL (difference of 0.12 mm).

--The mean BCVA (-0.01±0.1 logMAR) and mean daily wearing time (13.2±2.6 hours) were similar among the three groups.

--All groups adapted to their lenses with no reported adverse events, complaints or discomfort.

Finally, as opposed to SVL, spectacle lenses with aspherical lenslets effectively delayed myopia development and axial elongation. Lenslet asphericity enhanced myopia regulation efficacy.

Source: https://bjo.bmj.com/content/early/2021/04/01/bjophthalmol-2020-318367?rss=1
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