Prior studies of time-to-contact (TTC) focused on judgments of unoccluded approaching objects. P. R. DeLucia, M. K. Kaiser, J. M. Bush, L. E. Meyer, and B. T. Sweet (2003) showed that partial occlusion decreases an object's optical size and expansion rate and that the value of tau derived from the reduced optical size (relative rate of accretion;…

We describe a classroom-sized pinhole camera demonstration (camera obscura) designed to enhance students' learning of the visual system. The demonstration consists of a suspended rear-projection screen onto which the outside environment projects images through a small hole in a classroom window. Students can observe these images in a darkened…

This article presents an overview of driving for adolescents and adults who meet their states' visual requirements for low vision driving using bioptic lenses. It also discusses the outcomes of two studies of bioptic driver education.

Although considerable progress has been made in understanding how adults perceive their direction of self-motion, or heading, from optic flow, little is known about how these perceptual processes develop in infants. In 3 experiments, the authors explored how well 3- to 6-month-old infants could discriminate between optic flow patterns that…

The booklet describes seven Wisconsin outreach programs for visually impaired persons. Offered by the Educational Services Center for the Visually Impaired, the seven programs focus on the following topics (sample subtopics in parentheses): (1) comprehensive child evaluations (helping local school districts provide individualized educational…

Through seriation, verbal seriation, and conservation tasks, investigated blind, partially sighted, and sighted children's understanding of quantity. Subjects were 81 children equally dispersed through these 3 groups. Age range was 4 to 17 years. Found similarity in concept acquisition among three groups that extended beyond quantity conservation…

A closed-circuit television system was used with a five-year-old girl with severely limited vision to develop visual skills, especially skills related to concept formation. At the end of training, the girl could recognize lines, forms, shapes, letters, numbers, and words and could read short sentences. (Author/JDD)

In this article, a practical demonstration suitable for any biology college classroom is presented. With the examples of a complex biological specimen (slug's radula) and a simple reference specimen (electron microscopical grid imprint in gelatin), both of which can be easily prepared, the capabilities of two imaging modes commonly used in optical…

Purpose: It has long been known that children with specific language impairment (SLI) can demonstrate difficulty with auditory speech perception. However, speech perception can also involve the integration of both auditory and visual articulatory information. Method: Fifty-six preschool children, half with and half without SLI, were studied in…

A volume in the "Dimensions in Early Learning Series" this monograph proposes suggestions for parents and teachers to supplement normal classroom procedures in the area of visual learning. Chapter I concludes that a child's development of visual skills is directly influenced by inborn tendencies, physical characteristics, and environmental…

Semi-structured interviews and objective measures were used to examine psychological, behavioral, and visual factors contributing to satisfactory rehabilitation for 14 partially sighted older adults and a control group. Correlates of the successful use of low-vision aids included emotional and practical support as well as past use of near vision.…

This paper used a case study approach to explore the value of an objective procedure to evaluate the relative effectiveness of reading large print and reading regular print with low vision devices for 6 students (ages 8-16) with low vision. Data were collected on oral and silent reading rates, working distance, and oral reading miscues. (Author/DB)

A procedure was developed for gathering objective data on specific reading behaviors, to assist multidisciplinary teams in comparing the effectiveness of large and regular print for low-vision students. Case studies of six elementary-aged students with low vision found that the procedure was useful in making decisions concerning print size.…

The manual was intended to help school personnel (either an educator of the visually handicapped and/or a certified orientation and mobility instructor) evaluate the functional use of residual vision. The manual is organized in three major sections, which cover the following: (1) the general areas addressed in functional vision evaluation (such as…