Influence of additional astigmatism on distance-corrected near visual acuity and reading performance

Casagrande, Maria; Baumeister, Martín; Bühren, Jens; Klaproth, Oliver K.; Titke, Christine; Kohnen, Thomas

doi:10.1136/bjophthalmol-2013-303066

Cited by 25 publications

(32 citation statements)

References 22 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In young adults, even relatively small levels (1.00 D) of induced astigmatism were shown to reduce reading performance, particularly for induced ATR astigmatism and small print sizes . Induced astigmatism has also been reported to reduce reading speeds in presbyopes and in pre‐presbyopes under cycloplegia . A significant reduction in task performance of a computer based editing task (increased task completion time and number of errors) was also found to occur with 1.50 D of induced astigmatism .…”

Section: Visual and Functional Impact Of Astigmatismmentioning

confidence: 91%

The visual and functional impacts of astigmatism and its clinical management

Read

Vincent

Collins

2014

Ophthalmic Physiologic Optic

View full text Add to dashboard Cite

Purpose: To provide a comprehensive overview of research examining the impact of astigmatism on clinical and functional measures of vision, the short and longer term adaptations to astigmatism that occur in the visual system, and the currently available clinical options for the management of patients with astigmatism. Recent findings: The presence of astigmatism can lead to substantial reductions in visual performance in a variety of clinical vision measures and functional visual tasks. Recent evidence demonstrates that astigmatic blur results in short-term adaptations in the visual system that appear to reduce the perceived impact of astigmatism on vision. In the longer term, uncorrected astigmatism in childhood can also significantly impact on visual development, resulting in amblyopia. Astigmatism is also associated with the development of spherical refractive errors. Although the clinical correction of small magnitudes of astigmatism is relatively straightforward, the precise, reliable correction of astigmatism (particularly high astigmatism) can be challenging. A wide variety of refractive corrections are now available for the patient with astigmatism, including spectacle, contact lens and surgical options. Conclusion: Astigmatism is one of the most common refractive errors managed in clinical ophthalmic practice. The significant visual and functional impacts of astigmatism emphasise the importance of its reliable clinical management. With continued improvements in ocular measurement techniques and developments in a range of different refractive correction technologies, the future promises the potential for more precise and comprehensive correction options for astigmatic patients.

show abstract

Section: Visual and Functional Impact Of Astigmatismmentioning

confidence: 91%

The visual and functional impacts of astigmatism and its clinical management

Read

Vincent

Collins

2014

Ophthalmic Physiologic Optic

View full text Add to dashboard Cite

show abstract

“…Patterns of fluid accumulation in CRVO associated with macular edema are also described. The cystic accumulation of intraretinal fluid or cystoid macular edema (CME), subretinal fluid (SRF) or combined CME and SRF patterns are used as it has been reported previously [57]. …”

Section: Methodsmentioning

confidence: 99%

Central Retinal Vein Occlusion in Younger Swedish Adults: Case Reports and Review of the Literature

Wittström

2017

TOOPHTJ

View full text Add to dashboard Cite

Purpose:To investigate associated systemic diseases, other conditions, visual outcome, ocular complications and treatment in Swedish patients younger than 50 years with central retinal vein occlusion (CRVO) and reviewing the literature.Methods:Twenty-two patients with CRVO, younger than 50 years, were examined with full-field electroretinography (ERG) within 3 months after a thrombotic event, or were periodically examined and were observed for at least 6 months. In 18 of these patients, the initial retinal ischemia was studied using the cone b-wave implicit time in the 30 Hz flicker ERG. Fifteen patients also underwent fluorescein angiography. Optical coherence tomography (OCT) was performed in 14 patients. The patients studied were divided into two groups, non-ischemic and ischemic, which were compared. All patients underwent ocular and systemic examination, as well as complete screening for thrombophilic risk factors.Results:Of the 22 patients, 15 had non-ischemic type of CRVO and 7 the ischemic type. Patients with non-ischemic CRVO showed significantly improved visual acuity (VA) at the final examination (p=0.006). Patients with ischemic CRVO showed no significant reduction in VA at the final examination (p=0.225). Systemic hypertension (27% in non-ischemic CRVO and 29% in ischemic CRVO) was the most prevalent systemic risk factor for CRVO. The mean central foveal thickness (CFT) decreased significantly from 402.3±136.2 (µm) at the initial examination to 243.8±48.1 (µm) at the final examination in the non-ischemic group (p=0.005). The mean initial CFT was 444.5±186.1 (µm) in the ischemic CRVO group, which decreased to 211.5±20.2 (µm) at the final visit (p=0.068). Pigment dispersion syndrome (PDS)/pigmentary glaucoma (PG), ocular hypertension and dehydration were equally frequent; four patients each (18%) out of 22. The clinical course of 4 younger patients with PDS/PG are described.Conclusion:The patients with non-ischemic CRVO showed significantly improved VA and significantly decreased CFT at the final examination. Systemic hypertension was the most prevalent risk factor for CRVO. Younger adults with CRVO also had a high prevalence of PDS/PG, ocular hypertension and dehydration. This study highlights the importance of careful IOP monitoring, and the need to investigate possible PDS/PG and to obtain an accurate history of the patient including alcohol intake and intense exercise.

show abstract

“…In younger adults (18–33 years), Wills et al demonstrated that simulated astigmatism as low as 1.00 D significantly reduced reading speed (Discrete Reading Rate test) by up to 24 per cent for smaller text sizes. In a more recent study, Casagrande et al showed that simulated astigmatism as low as 0.75 D reduced reading performance by approximately 18 per cent (Salzburg Reading Desk) in young adults, but did not control for the change in spherical equivalent power associated with the imposed astigmatic defocus.…”

Section: Vision Refractive Error and Academic Performancementioning

confidence: 98%

Do reduced visual acuity and refractive error affect classroom performance?

Hopkins

Narayanasamy

Vincent

et al. 2020

Clinical and Experimental Optometry

View full text Add to dashboard Cite

The role of visual acuity and refractive errors in the academic performance of children is controversial due to the variable quality of the research in this area and the mixed findings reported. This review aims to provide clarity by reviewing and critiquing relevant peerreviewed publications and also summarises what is known regarding the visual demands of modern classroom environments. The outcomes of this review suggest that while a number of studies have investigated the role of vision in relation to children's academic performances, the veracity of the evidence obtained from the majority of these studies is undermined by methodological limitations. Comparisons between studies are constrained by differences in experimental designs, instrumentation and sample characteristics. Despite these limitations, the weight of evidence suggests there is an association between academic performance and both visual acuity and refractive error in children. However, well-designed experimental studies are necessary to further understand the relationship between these parameters.

show abstract

Influence of additional astigmatism on distance-corrected near visual acuity and reading performance

Abstract: WTR astigmatism results in reduced reading parameters and NVA for -0.75 D and -1.5 D astigmatism compared with corresponding ATR astigmatism and no astigmatism added. No beneficial effect of astigmatism was detected.

Cited by 25 publications

References 22 publications

The visual and functional impacts of astigmatism and its clinical management

The visual and functional impacts of astigmatism and its clinical management

Central Retinal Vein Occlusion in Younger Swedish Adults: Case Reports and Review of the Literature

Do reduced visual acuity and refractive error affect classroom performance?

Contact Info

Product

Resources

About