Science

Spectacles

What role do accommodation and binocular vision issues play in eyestrain symptoms?

While 80% of pre-presbyopic adults with Digital Eye Strain symptoms preferred reading with low-addition lenses, the improvement in reading speed was generally small and did not appear to correlate with specific accommodation or binocular vision dysfunctions. In the 8% who showed a significant improvement in reading rate of at least 15%, a majority showed reduced accommodation amplitude.

The effect of online learning on myopia progression

By using a wearable device to objectively monitor visual behaviour, this study found progression in young myopic children was correlated with less time outdoors, more time working at near for online learning and less time spent wearing their glasses.

Myopia control and no rebound with Highly Aspherical Lenslet spectacles

This cross-over study investigated children wearing highly aspherical lenslet (HAL) spectacle lenses versus single vision spectacles over three six-month periods. The HAL lenses showed consistent myopia control efficacy and no rebound effect when discontinued over one of the six-month periods.

Two-year clinical trial results of aspherical lenslet spectacles for myopia control

This study reports two year results from a randomized clinical trial examining myopia control spectacle lenses with highly aspherical lenslets (HAL) or slightly aspherical lenslets (SAL). The findings showed the HAL lens controlled refractive and axial progression by 50-55% and SAL by around 30% over two years. Read more about the outcomes and comparisons to other myopia control spectacles here.

What is the effect of uncorrecting, undercorrecting and overcorrecting myopia in children?

This systematic review of 9 studies confirms that under-correction of myopia does not slow progression; rather, at least half of the studies have shown the myopia progression is accelerated. There was no benefit found in overcorrection, and the evidence for un-correction was equivocal. Clinically, this advocates for the full correction of myopia.

Do myopia controlling spectacles with lenslets affect visual quality?

When looking through the ‘treatment zones’ of three different types of myopia controlling spectacle lenses with lenslets, visual acuity is reduced by 3-5 letters and mid-to-high frequency contrast sensitivity is mildly affected compared to single vision spectacles. We’re yet to learn if small differences between designs may influence patient preference.