scholarly journals Peripheral Design of Progressive Addition Lenses and the Lag of Accommodation in Myopes

2017 ◽  
Vol 58 (9) ◽  
pp. 3319 ◽  
Author(s):  
Tim Schilling ◽  
Arne Ohlendorf ◽  
Saulius R. Varnas ◽  
Siegfried Wahl
Keyword(s):  
Lag Of Accommodation ◽  
Progressive Addition Lenses

Comparison of physiognomy and frame angle parameters using different devices to prescribe progressive addition lenses

2021 ◽  
pp. 1-8
Author(s):  
Oscar Garcia-Espinilla ◽  
Ines Gallegos-Cocho ◽  
Irene Sanchez ◽  
Pilar Cañadas ◽  
Raul Martin
Keyword(s):  
Progressive Addition Lenses

Design philosophy for progressive addition lenses

1993 ◽  
Vol 32 (1) ◽  
pp. 111 ◽  
Author(s):  
Günther H. Guilino
Keyword(s):  
Design Philosophy ◽  
Progressive Addition Lenses

A Novel Marking Reader for Progressive Addition Lenses Based on Gabor Holography

2016 ◽  
Vol 93 (5) ◽  
pp. 534-542 ◽  
Author(s):  
Beatriz Perucho ◽  
José Angel Picazo-Bueno ◽  
Vicente Micó
Keyword(s):  
Progressive Addition Lenses

scholarly journals A comparison of the visual status of dyslexic and non-dyslexic schoolchildren in Durban, South Africa

2011 ◽  
Vol 70 (1) ◽  
Author(s):  
S. O. Wajuihian ◽  
K. S. Naidoo
Keyword(s):  
South African ◽  
Educational Achievement ◽  
Economic Status ◽  
African Population ◽  
South African Population ◽  
Research Perspective ◽  
Black South African ◽  
Visual Status ◽  
Lag Of Accommodation ◽  
Vision Defects

Background:   Reading difficulties constitute an impediment to the learning process and in the educational achievement of a child. Consequently, several studies examined the visual status of dyslexic children in the Caucasian populations. Such studies are lacking in the African populations.Aim: To determine the prevalence of vision defects and investigate if there is an association between dyslexia and vision in a South African population of dyslexic school children.  Methods:  This comparative study assessed the visual function of 62 children (31 dyslexic and 31 normally-reading children), mean age 13 ± 1.42 years and 11.90 ± 0.93 years respectively. The participants were matched for gender, race and socio-economic status. The visual functions evaluated and the techniques used were: visual acuity (LogMAR acuity chart), refraction (static retinos-copy), ocular alignment (cover test) near point of convergence (RAF rule), accommodation facility (± 2 D flipper lenses), amplitude of accommodation (push-up method) relative accommodation(trial lenses) accommodation posture (monocular estimation technique) and vergence reserves (prism bars). Results:   In the following, results are  provided for the dyslexic versus control:  Refractive errors: (hyperopia 6.5% vs 3%,) (myopia 6.5% vs 6.5%), (astigmatism 10% vs 13%), (anisometropia 6.5% vs 6.5%) (amblyopia 6.5% vs 0%), (remote NPC 33% vs 48%) (esophoria at near 3%  vs 0%) (exophoria at near 9.5% vs 0%), (accommodative infacility at near  54% vs 33%), lag of accommodation 39.28% vs 41,93%,  (poor positive fusional amplitude at near, 25% vs 16%). Only the binocular accommodative facility at near was significantly associated with dyslexia (p=0.027). Conclusion: The prevalence of vision defects was similar between the dyslexic and non-dyslexic participants, which suggest that an association between dyslexia and vision variables investigated, cannot be inferred.  This study provides a research perspective on the prevalence of vision defects in a Black South African population of dyslexic children and has clinical relevance and implications for the assessment, detection and management of vision anomalies in dyslexic schoolchildren. (S Afr Optom 2011 70(1) 29-43) 

Design and Optimization of Main Curvature Difference for Progressive Addition Lenses

2012 ◽  
Vol 32 (6) ◽  
pp. 0622001
Author(s):  
吴泉英 Wu Quanying ◽  
唐运海 Tang Yunhai ◽  
钱霖 Qian Lin ◽  
刘琳 Liu Lin
Keyword(s):  
Design And Optimization ◽  
Progressive Addition Lenses

Optimizing Design for Progressive Addition Lenses by Mean Curvature Flow

2011 ◽  
Vol 31 (5) ◽  
pp. 0522001
Author(s):  
唐运海 Tang Yunhai ◽  
吴泉英 Wu Quanying ◽  
钱霖 Qian Lin ◽  
刘琳 Liu Lin
Keyword(s):  
Mean Curvature ◽  
Mean Curvature Flow ◽  
Curvature Flow ◽  
Optimizing Design ◽  
Progressive Addition Lenses
Sign in / Sign up

Export Citation Format

Share Document