Aug 2026· Annals of Medicine & Surgery· 0 citations· 25 references
TL;DR
It is suggested that when low myopic astigmatism is corrected using spherical-equivalent soft contact lenses, certain binocular vision parameters may demonstrate acute changes and careful binocular vision assessment may therefore be beneficial when prescribing simplified spherical correction in astigmatic patients.
Abstract
To investigate the acute, same-day changes in binocular vision parameters when switching from spectacle wear to spherical-equivalent soft contact lens wear in patients with low myopic astigmatism.
This acute, same-day comparative study included 36 participants aged 15–35 years with low myopic astigmatism. A comprehensive binocular vision assessment – including accommodative amplitude (AA), accommodative facility (AF), stereoacuity, cover test, horizontal phoria, near point of convergence (NPC), negative relative accommodation (NRA), positive relative accommodation (PRA), positive fusional vergence, negative fusional vergence, and lag of accommodation – was performed with both spectacles and spherical-equivalent soft contact lenses. Measurements were obtained following a 30-minute lens stabilization period. Mean differences between conditions were analyzed using paired
t
-tests that accounted for within-subject correlation.
When comparing spherical-equivalent soft contact lenses with spectacles, small but statistically significant differences were observed in selected binocular parameters. The NPC was slightly more receded with contact lenses, with a mean difference of −0.36 ± 0.76 cm compared with spectacles (
P
< 0.01). The lag of accommodation showed a small reduction with contact lens wear (mean difference: −0.11 ± 0.31 D;
P
= 0.03). PRA was modestly increased with contact lenses, with a mean difference of +0.35 ± 0.16 D (
P
= 0.03). No statistically significant differences were found between spectacles and contact lenses for AA, AF, stereoacuity, cover test findings, horizontal phoria, NRA, positive fusional vergence, or negative fusional vergence (all
P
> 0.05).
These findings suggest that when low myopic astigmatism is corrected using spherical-equivalent soft contact lenses, certain binocular vision parameters may demonstrate acute changes. Careful binocular vision assessment may therefore be beneficial when prescribing simplified spherical correction in astigmatic patients.
While contact lenses distinctly alter accommodative and vergence dynamics, they may offer functional advantages in stereopsis for higher degrees of anisometropia, which suggests a potential functional advantage in stereopsis for higher degrees of anisometropia.
Adithep Daradas, Busita Sankapong, Chanida Klamsakun et al.· Journal of Optometry· 0 citations
In this cross-sectional observational analysis, children wearing HAL spectacle lenses showed higher adjusted odds of measurable dynamic and gross stereopsis than those wearing single-vision lenses, while fine stereopsis remained comparable.
Zhuotong Wu, Yuhao Ye, Yong Ma et al.· Clinical Ophthalmology· 0 citations
PURPOSE
To evaluate the impact of toric versus spherical equivalent contact lenses on visual acuity and eye-movement-based reading performance in young adults with low-to-moderate astigmatism, using Chinese reading passages to reflect real-world tasks.
METHODS
A participant-masked, randomised, two-period crossover study was conducted in 28 young adults (aged 18-35 years) with low-to-moderate refractive astigmatism (-0.75 to -2.00 dioptre cylinder [DC]). Participants wore toric and spherical equivalent daily disposable soft contact lenses (SCLs) for 1 week each, in random order. Binocular distance, intermediate and near visual acuity were measured and reading performance was assessed during silent reading of standardised Chinese passages using the EyeLink 1000 Plus. Key metrics included reading speed, fixation count, fixation per minute (fpm), fixation per word (fpw), saccade characteristics and regressions.
RESULTS
Toric lenses significantly improved binocular intermediate visual acuity at 66 cm (-0.11 ± 0.07 vs. -0.07 ± 0.08 logMAR, p = 0.04) and reading speed (345.37 ± 122.41 vs. 322.49 ± 130.65 characters per minute [cpm], p = 0.03), compared with spherical equivalent lenses. Additionally, toric correction was associated with more efficient eye-movement behaviour, including fewer fixations per word, fewer total fixations, fewer total saccades and fewer regressions (all p < 0.05).
CONCLUSION
Toric SCLs improved intermediate visual acuity and Chinese reading performance relative to spherical equivalent correction in young adults with low-to-moderate astigmatism. These findings support the functional benefit of full astigmatic correction for visually demanding mid-range reading tasks.
increasing myopic anisometropia was associated with a severity-dependent pattern of subclinical alterations in accommodative balance, ocular alignment, fusional vergence, sensory fusion, and stereoacuity in spectacle-corrected children with normal BCVA, and these findings support a multifactorial interpretation involving accommodative, optical, vergence, and sensory factors.
Ningxin Dou, Xiao-Qi Dong, Jiayan Li et al.· Optometry and Vision Science· 0 citations
Purpose: To measure high contrast visual acuity (HCVA) when presbyopic soft contact lens (CL) wearers, requiring a spectacle addition from +0.75 to +1.75 dioptres were fit bilaterally with delefilcon A daily disposable multifocal (DT1 MF) CLs and senofilcon A daily disposable multifocal (AOM MF) CLs. Methods: In this prospective, randomized, double-masked, cross-over, non-inferiority study, presbyopic CL wearers wore two types of multifocal CLs for 1 hour each. HCVA was measured monocularly and binocularly at 6m, 66cm and 40cm under photopic and mesopic conditions. Participants rated subjective visual clarity (0–100 scale, 100=very clear) after each HCVA assessment. Pupil size was assessed under photopic and mesopic conditions. Results: Twenty-eight participants (48.6 ± 5.3 years) completed the study. DT1 MF was non-inferior to AOM MF in HCVA at 6m, 66cm and 40cm in photopic and mesopic conditions for the dominant and non-dominant eye, and binocularly. There were no statistically significant differences between lenses for subjective visual clarity ratings for any of the viewing distances, whether evaluated for photopic or mesopic conditions for the dominant or non-dominant eye or binocularly. Mean pupil size in the dominant eye was 3.6 ± 0.5mm (2.6 to 4.5mm) and 5.1 ± 0.8mm (2.8 to 6.1mm) in photopic and mesopic conditions respectively. HCVA under photopic or mesopic illumination at 6m, 66cm or 40cm was not associated with pupil size (Pearson correlation, all p>0.05). Conclusion: Both lenses provided good vision across a variety of distances at high and low illumination. DT1 MF was non-inferior to AOM MF in HCVA under photopic and mesopic illumination at distance, intermediate and near. HCVA at all distances with both study lenses was independent of pupil size. Despite their different design, both study lenses performed equally well and provide a suitable vision correction for presbyopic CL wearers, irrespective of pupil size.
Ulrike Stahl, Jill Woods, Alison Ng et al.· Clinical Ophthalmology· 0 citations
FS-LASIK combined with monovision is an effective treatment for patients aged over 40y with myopia and presbyopia, which not only improves visual acuity but also achieves high patient satisfaction and improves postoperative BCC.
Yuanyuan Qi, Qi Li, Gui-Li Wang et al.· International Journal of Oph...· 0 citations