scholarly journals An Impact analysis of visual performance to information for mobility in people with low vision

2010 ◽  
Vol 27 (0) ◽  
pp. 893-902
Author(s):  
Takao YANAGIHARA ◽  
Keisuke SAITO ◽  
Hiroshi KITAGAWA ◽  
Akihiro MIHOSHI
Keyword(s):  
Impact Analysis ◽  
Low Vision ◽  
Visual Performance

The Effects on Visually Impaired Children of Viewing Fluorescent Stimuli under Black-Light Conditions

1998 ◽  
Vol 92 (5) ◽  
pp. 313-321 ◽  
Author(s):  
S.J. LaGrow ◽  
J-P Leung ◽  
S. Leung ◽  
P. Yeung
Keyword(s):  
Visual Acuity ◽  
White Light ◽  
Visually Impaired ◽  
Low Vision ◽  
Visual Performance ◽  
Light Conditions ◽  
Black Light ◽  
High Acuity ◽  
Impaired Children ◽  
Visually Impaired Children

In this study, 30 children with low vision (divided into a high and a low visual acuity group) were presented with stimuli under four conditions (white stimuli-white light, orange stimuli-white light, white stimuli-black light, and orange stimuli-black light) and were asked to rank their preferences for the four conditions. The goal was to determine the effects of the various combinations of stimuli and lighting on the children's visual performance. The orange stimuli viewed under black light resulted in the best performance overall, benefited the low-acuity group more than the high-acuity group, and was the most-preferred condition for both groups.

Basic Quantitative Assessment of Visual Performance in Patients with Very Low Vision

2010 ◽  
Vol 51 (2) ◽  
pp. 1255 ◽  
Author(s):  
Michael Bach ◽  
Michaela Wilke ◽  
Barbara Wilhelm ◽  
Eberhart Zrenner ◽  
Robert Wilke
Keyword(s):  
Quantitative Assessment ◽  
Low Vision ◽  
Visual Performance

Assessment and Training of Low Vision Clients for Mobility

1989 ◽  
Vol 83 (9) ◽  
pp. 439-446 ◽  
Author(s):  
A.G. Dodds ◽  
D.P. Davis
Keyword(s):  
Training Program ◽  
Low Vision ◽  
Real Life ◽  
Visual Assessment ◽  
Visual Performance ◽  
Practical Relevance ◽  
Mobility Performance ◽  
Perceptual Functioning ◽  
Clinical Measures ◽  
And Training

This article discusses the need to develop ecologically valid measures of visual functioning and mobility performance in the context of current theories of perceptual functioning and learning, and describes the development of a visual assessment and training program, known as OCULA. An evaluation of the effectiveness of four tasks in predicting initial and final low vision mobility performance demonstrated that the tasks are better predictors of visual performance than are existing clinical measures and that learning can be transferred to real-life mobility situations. The results are interpreted in terms of differentiation theory, and the practical relevance of the approach to the training of low vision clients is emphasized, as is the potential of the system as a research tool.

scholarly journals A practical logMAR near reference table for low vision practitioners: Design and applications

2006 ◽  
Vol 65 (4) ◽  
Author(s):  
Alabi O. Oduntan
Keyword(s):  
Visual Acuity ◽  
Low Vision ◽  
Optical Devices ◽  
Visual Performance ◽  
Viewing Distance ◽  
Reference Table ◽  
Standard Values ◽  
Print Size

LogMAR  charts  are  particularly  useful  for visual acuity (VA) measurement for low vision patients  as  they  simplify  conversion  of  non-standard  viewing  distance  visual  acuities  to standard values. Also, the process of predicting various  quantities  involved  in  the  prescrip-tion of optical devices for patients are greatly facilitated.  However, the processes involved in the use of this logMAR principle require series of multiplication and division by the logMAR ratio  of  1.2589.   A  table  computed  and  pre-sented in this article provides easy reference for the conversions and predictions needed for the various quantities at near.  The table (Table 1) is computed using the logMAR scale of 1.2589 in logMAR, M and N notations. The table con-tains VA values between logMAR 1.4 (10M or 80 point) and logMAR 0.18 (1.3M or10 point) in steps of 1.2589 for reduced (non-standard) viewing distances  ranging from 31.8 cm (0.32 m)  to  3.2  cm  (0.03M).    The  table  contains values  which  can  be  used  to  convert  visual acuity values measured at reduced near view-ing distances to standard visual acuity values.  The values also can be used to represent any of  the  quantities  involved  in  the  prescription of optical devices for low vision patients. The use of the table for converting reduced distance VA values to standard values and for predict-ing optical powers and visual performance of low vision patients are discussed with relevant examples. Like all principles based on the log-MAR principles, the table is quite versatile in VA  conversion  and  prediction  of  the  various quantities  such  as  print  size  that  can  be  read by  the  low  vision  patient  when  factors  such as  viewing  distance    or  power  are  varied.

Low-vision aids improve the visual performance of children with bilateral chorioretinal coloboma

2018 ◽  
Vol 22 (3) ◽  
pp. 202-206
Author(s):  
Tiago M. Rodrigues ◽  
Liliana Cortez ◽  
Joaquim N. Murta ◽  
Catarina Paiva
Keyword(s):  
Low Vision ◽  
Visual Performance ◽  
Low Vision Aids
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