scholarly journals The Influence of Viewpoint and Object Detail in Blind People When Matching Pictures to Complex Objects

Perception ◽  
10.1068/p5596 ◽  
2009 ◽  
Vol 38 (8) ◽  
pp. 1234-1250 ◽  
Author(s):  
Morton A Heller ◽  
Tara Riddle ◽  
Erin Fulkerson ◽  
Lindsay Wemple ◽  
Anne McClure Walk ◽  
...  
Keyword(s):  
Visually Impaired ◽  
Visual Experience ◽  
Low Vision ◽  
Target Object ◽  
Picture Perception ◽  
Blind People ◽  
Matching Accuracy ◽  
Complex Objects ◽  
Overall Performance ◽  
Top View

We examined haptic viewpoint effects in blindfolded-sighted (BS) and visually impaired subjects: early blind (EB), late blind (LB), and very low vision (VLV). Participants felt complex objects and matched tangible pictures to them. In experiment 1, the EB and BS subjects had similar overall performance. Experiment 2 showed that the presence of a detail on the target object lowered performance in the BS subjects, and that matching accuracy was lower overall for top views for the blind subjects. In experiments 3–5, EB, LB, VLV, and BS subjects made judgments about perspective pictures of a model house with more salient object details. In experiment 3, performance was higher for side views than for corner views. Elevated side views were identified more readily than elevated corner views in experiment 4. Performance for top views was higher than for elevated side views in experiment 5, given the relative simplicity of the top-view depictions and salient details. The EB and BS participants had somewhat lower matching accuracy scores than the other groups. We suggest that visual experience is helpful, but not essential for picture perception. Viewpoint effects may vary with experience and object complexity, but the relevant experience need not be specifically visual in nature.

scholarly journals The Haptic Müller-Lyer Illusion in Sighted and Blind People

Perception ◽  
10.1068/p3340 ◽  
2002 ◽  
Vol 31 (10) ◽  
pp. 1263-1274 ◽  
Author(s):  
Morton A Heller ◽  
Deneen D Brackett ◽  
Kathy Wilson ◽  
Keiko Yoneyama ◽  
Amanda Boyer ◽  
...  
Keyword(s):  
Visual Imagery ◽  
Visual Experience ◽  
Low Vision ◽  
Blind People ◽  
Spatial Distortion ◽  
Lyer Illusion ◽  
Visual Status ◽  
Nonsignificant Difference ◽  
Congenitally Blind ◽  
Size Estimates

We examined the effect of visual experience on the haptic Müller-Lyer illusion. Subjects made size estimates of raised lines by using a sliding haptic ruler. Independent groups of blindfolded-sighted, late-blind, congenitally blind, and low-vision subjects judged the sizes of wings-in and wings-out stimuli, plain lines, and lines with short vertical ends. An illusion was found, since the wings-in stimuli were judged as shorter than the wings-out patterns and all of the other stimuli. Subjects generally underestimated the lengths of lines. In a second experiment we found a nonsignificant difference between length judgments of raised lines as opposed to smooth wooden dowels. The strength of the haptic illusion depends upon the angles of the wings, with a much stronger illusion for more acute angles. The effect of visual status was nonsignificant, suggesting that spatial distortion in the haptic Müller-Lyer illusion does not depend upon visual imagery or visual experience.

scholarly journals Smart Stick for Blind People

2021 ◽  
Vol 9 (VI) ◽  
pp. 1723-1726
Author(s):  
Mayank Kunjilwar
Keyword(s):  
Visually Impaired ◽  
Low Vision ◽  
Physical World ◽  
Blind People ◽  
Human Being ◽  
Blind Person ◽  
Short Pulses ◽  
Important Thing ◽  
Sensor Signals ◽  
To Receive

As we know that sense of vision to human being is an important thing in our life, but there is some people who have lack of mobility because of blindness The objective of this project is used to help the blind people and they are able to easily interact with the physical world by using this smart blind stick. About 285 million people are visually impaired worldwide: 39 million are blind and 246 million have low vision. If you notice them , you can very well know about it they can’t walk without the help of other. One has to ask guidance to reach their destination. Using this blind stick , a person can walk more confidently. This stick with ultrasonic sensor detects the object in front of the person and give response to the user by alarm from the buzzer, which will give a high buzz as the object gets closer to the blind person. So, the person can walk without any fear. The LDR sensor are used in the stick to identify the day and night for the blind people. The microcontroller (Arduino Nano) to receive the sensor signals and process them to short pulses to the Arduino pins where buzzers are connected. This device will be best solution to overcome their difficulties and help

Touching Blind Bodies: A Critical Inquiry into Pedagogical and Cultural Constructions of Visual Disability in the Nineteenth Century

2018 ◽  
Author(s):  
Heather Tilley ◽  
Jan Eric Olsén
Keyword(s):  
Nineteenth Century ◽  
Visually Impaired ◽  
Blind People ◽  
Embodied Experience ◽  
Visual Disability ◽  
Visually Impaired People ◽  
Educational Challenges ◽  
Impaired People ◽  
The Senses ◽  
Cultural Constructions

Changing ideas on the nature of and relationship between the senses in nineteenth-century Europe constructed blindness as a disability in often complex ways. The loss or absence of sight was disabling in this period, given vision’s celebrated status, and visually impaired people faced particular social and educational challenges as well as cultural stereotyping as poor, pitiable and intellectually impaired. However, the experience of blind people also came to challenge received ideas that the visual was the privileged mode of accessing information about the world, and contributed to an increasingly complex understanding of the tactile sense. In this chapter, we consider how changing theories of the senses helped shape competing narratives of identity for visually impaired people in the nineteenth century, opening up new possibilities for the embodied experience of blind people by impressing their sensory ability, rather than lack thereof. We focus on a theme that held particular social and cultural interest in nineteenth-century accounts of blindness: travel and geography.

Hierarchical composition in complex object drawing

2019 ◽  
Author(s):  
Michiru Makuuchi
Keyword(s):  
Hierarchical Structure ◽  
Homo Sapiens ◽  
Hierarchical Structures ◽  
Target Object ◽  
Point Of View ◽  
Complex Object ◽  
Complex Objects ◽  
Cognitive Domains ◽  
Adult Participants ◽  
Symbolic Cognition

Symbolic behaviours such as language, music, drawing, dance, etc. are unique to humans and are found universally in every culture on earth1. These behaviours operate in different cognitive domains, but they are commonly characterised as linear sequences of symbols2,3. One of the most prominent features of language is hierarchical structure4, which is also found in music5,6 and mathematics7. Current research attempts to address whether hierarchical structure exists in drawing. When we draw complex objects, such as a face, we draw part by part in a hierarchical manner guided by visual semantic knowledge8. More specifically, we predicted how hierarchical structure emerges in drawing as follows. Although the drawing order of the constituent parts composing the target object is different amongst individuals, some parts will be drawn in succession consistently, thereby forming chunks. These chunks of parts would then be further integrated with other chunks into superordinate chunks, while showing differential affinity amongst chunks. The integration of chunks to an even higher chunk level repeats until finally reaching the full object. We analysed the order of drawing strokes of twenty-two complex objects by twenty-five young healthy adult participants with a cluster analysis9 and demonstrated reasonable hierarchical structures. The results suggest that drawing involves a linear production of symbols with a hierarchical structure. From an evolutionary point of view, we argue that ancient engravings and paintings manifest Homo sapiens’ capability for hierarchical symbolic cognition.

Low Vision Enhancement: The Use of Figure–Ground Reversals with Visually Impaired Children

1985 ◽  
Vol 79 (2) ◽  
pp. 64-69 ◽  
Author(s):  
Laurence R. Gardner
Keyword(s):  
Visually Impaired ◽  
Low Vision ◽  
Visual Functioning ◽  
Black Background ◽  
Printed Materials ◽  
Impaired Children ◽  
Visually Impaired Children

Describes an investigation of how different figure-ground contrast combinations affect the visual functioning of visually impaired children. The study employed the use of field reversals—printing white and yellow foregrounds on a black background—to decrease the amount of light reflected from printed materials to the eye. Eighteen visually impaired children ranging in age from nine years, four months to 14 years, six months participated in this study. The findings indicated that neither reversals in contrast nor chromaticity differences were effective measures for increasing visual functioning.

A Survey of Blind Orientation and Mobility Specialists about the Accommodations and Teaching Strategies They Use when Providing Orientation and Mobility Services

2021 ◽  
pp. 0145482X2110180
Author(s):  
Nora Griffin-Shirley ◽  
Laura Bozeman ◽  
The Nguyen ◽  
Vitalis Othuon ◽  
Anita Page ◽  
...  
Keyword(s):  
Visually Impaired ◽  
Online Survey ◽  
Low Vision ◽  
Visual Impairments ◽  
Teaching Techniques ◽  
Preparation Programs ◽  
Self Advocacy ◽  
Blind And Visually Impaired ◽  
Orientation And Mobility ◽  
Immersion Training

Introduction: The purpose of the study was to survey orientation and mobility (O&M) instructors who are blind concerning the identification of accommodations, teaching techniques, and resources to teach students with visual impairments (i.e., blindness or low vision). Methods: The study utilized an online survey via Qualtrics (2019) with 27 closed- and open-ended items to identify accommodations, teaching techniques, and resources needed. The survey was e-mailed to membership and certification organizations requesting O&M instructors who are blind to participate for 12 weeks. The participants were 15 O&M specialists, mostly male and Caucasian. Survey data were then analyzed using descriptive statistics. Results: Forty percentage of the participants reported that there were minimal standards that they had to demonstrate prior to their admittance into an O&M program. About one-fourth of the participants mentioned their program was modified because of their visual impairment. Eleven participants (73%) reported that their nonvisual instructional strategies and techniques were predominantly gained through their university programs or other visually impaired instructors (27%, n = 4). Discussion: Aspects of this study that are similar to the current literature are smaller faculty-to-student ratios for blindfold or simulation cane courses, accommodations used by participants, and suggestions for monitoring the safety of students. The results revealed the participants’ strong belief in the importance of immersion training, the use of the Structured Discovery Cane Travel (SDCT), nonvisual skills during O&M instruction, sleep shades, and students’ problem-solving abilities. Implication for practitioners: Although the participants had received SDCT immersion training, most personnel preparation programs approved by the Association for the Education and Rehabilitation of Blind and Visually Impaired do not use this method. For this reason, it is important for faculty to identify best teaching practices from among all programs and to integrate these practices into their curricula. Sharing best practices could strengthen all programs. Moreover, students with visual impairments should be taught early about self-advocacy and the ability to have helpful knowledge about one’s skills at a university and in the workplace.

The Visually Impaired Driver in New York State

1979 ◽  
Vol 73 (6) ◽  
pp. 228-232
Author(s):  
Norman J. Weiss
Keyword(s):  
New York ◽  
Visually Impaired ◽  
Low Vision ◽  
New York State ◽  
Lens System ◽  
York State ◽  
The Third ◽  
Road Signs ◽  
Third Phase ◽  
Usual Manner

Describes a three-part driving program for low vision persons. Potential trainees are first interviewed to detect problems that may interfere with success. Suitable candidates are then trained to quickly detect and recognize objects through a bioptic lens system. In the third phase, a mobility instructor gives training in various aspects of the automobile and driving, and the trainee is quizzed on road signs and markings while riding as a passenger. Students successfully completing all three phases may then go on to obtain a Learner's Permit and take driving lessons in the usual manner.

Driving with Low Vision

1979 ◽  
Vol 73 (9) ◽  
pp. 345-350
Author(s):  
Dennis K. Kelleher
Keyword(s):  
Preliminary Data ◽  
Visually Impaired ◽  
Low Vision ◽  
Current Status ◽  
Training Sequences ◽  
Conducting Research ◽  
Licensing Standards

Discusses the current status of driving with low vision, both with and without a bioptic telescope. It specifies licensing criteria, training sequences, and identifies problem areas. Preliminary data from a comparison of safety records in three states are presented and recommendations are made for future licensing standards and for conducting research on visually impaired drivers.

scholarly journals Effects of Line Spacing on Reading Performance of Normally Sighted and Simulated Visually-Impaired Subjects: A Pilot Study Using Arabic Words

2017 ◽  
Vol 9 (8) ◽  
pp. 84
Author(s):  
Abdullah Z. Alotaibi
Keyword(s):  
Visually Impaired ◽  
Low Vision ◽  
Reading Rate ◽  
Reading Performance ◽  
White Background ◽  
Significant Difference ◽  
Line Spacing ◽  
The Difference ◽  
Letter Size ◽  
Visually Impaired Persons

The study aims to evaluate the role of line spacing during reading in normal and visually-impaired persons. A total of 225 normally-sighted participants with mean age of 23.7 years were asked to read Arabic sentences in a randomized order. Each Arabic sentence contains 7 lines with and without simulated cataract. The words were printed with black letters on white background to enhance contrast and fonts were in Times New Roman and of N12 letter size. The reading pages were placed on reading stand situated 25 cm away from the subject’s eyes. The simulated cataract was created by using a Bernell Cling Patch Occluder. This reduced the visual acuity of all subjects to 20/60. Each line of the text was separated by different line spacing namely: single space, 1.5, 2.0, 2.5, 3.0 and 4.0 which represents, 0.5 cm, 0.8 cm, 1.1 cm, 1.4 cm, 1.7 cm and 2.0 cm, respectively. The sheets were presented randomly and participants’ voices were recorded as they read under a controlled time. The tape was analysed later and reading rate was calculated. There was a significant difference (p<0.0001) in reading rates between the normal sighted persons and the visually impaired persons for all line spacing. Modifying the spacing between lines in prints had a significant impact (p<0.0001) on the reading rate of the visually impaired but not in normally-sighted persons (p˃0.05). Intermediate line spacing (2 and 2.5) increased the reading rate of the visually impaired persons significantly more (p<0.001) than other line spacing, but smaller or larger line spacing slowed their reading rate, significantly (p<0.001). The visually-impaired persons reported that they felt the difference in reading prints with larger line spacing as compared with normal sighted participants who did not. It is beneficial to adequately modify the line spacing in prints commonly read by low vision persons. For Arab subjects the optimum line spacing to significantly improve reading in the visually impaired should range from 0.8 to 1.1 cm. This finding may be a useful for publishers of Arab prints targeting the visually impaired persons. Thus, the implication of the study in the field of health is that by establishing the least common line spacing visualized optimally among normal and simulated visually impaired persons would be fixed as default line spacing for Arab printing to achieve better reading performance.

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