scholarly journals Visual acuity differences within the normal range strongly alter visual perception: A cautionary tale for studies of special populations

2015 ◽  
Vol 15 (12) ◽  
pp. 324
Author(s):  
Matthew Roche ◽  
Brian Keane ◽  
Sabine Kastner ◽  
Thomas Papathomas ◽  
Steven Silverstein
Keyword(s):  
Visual Acuity ◽  
Visual Perception ◽  
Special Populations ◽  
Cautionary Tale ◽  
Normal Range

scholarly journals Optically correcting visual acuity beyond 20/20 improves visual perception: A cautionary tale for studies of special populations

2016 ◽  
Vol 16 (12) ◽  
pp. 241
Author(s):  
Lisa Cruz ◽  
Brian Keane ◽  
Sabine Kastner ◽  
Thomas Papathomas ◽  
Steven Silverstein
Keyword(s):  
Visual Acuity ◽  
Visual Perception ◽  
Special Populations ◽  
Cautionary Tale

Neuro-ophthalmology: Disorders of Visual Perception, Pupils, and Eyelids

2021 ◽  
pp. 821-833
Author(s):  
Shivram Kumar ◽  
Kelly D. Flemming
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Visual Perception ◽  
Visual Loss ◽  
Visual Field Defects ◽  
Clinical Disorders ◽  
Physical Findings ◽  
Abnormal Visual ◽  
Visual Changes ◽  
Field Defects

Visual loss may develop acutely, subacutely, or insidiously. The course may be transient, static, or progressive. This chapter reviews the causes, diagnosis, and treatment of various disorders resulting in visual loss or abnormal visual perception. In addition, it reviews clinical disorders of the eyelids and pupils. Disorders of visual perception involve visual acuity, color perception, visual field defects, and other visual changes. Historical information and physical findings on examination can help to localize the problem and define the cause.

scholarly journals A Novel Method for the Localization and Management of Traumatic Cyclodialysis Cleft

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Mingling Wang ◽  
Shufang Hu ◽  
Zhenquan Zhao ◽  
Tianlin Xiao
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
Intraocular Pressure ◽  
Clinical Study ◽  
Ultrasound Biomicroscopy ◽  
Slit Lamp ◽  
Normal Range ◽  
Postoperative Visual Acuity ◽  
Novel Method ◽  
Cyclodialysis Cleft

Purpose.To propose a novel surgical method for the localization and management of traumatic cyclodialysis clefts.Methods.Five patients with traumatic cyclodialysis clefts who underwent the innovative surgery were retrospectively reviewed. The new method was introduced to repair a cyclodialysis cleft with two running sutures from the middle to each end of the cleft under the guidance of a probe. Preoperative and postoperative visual acuity (VA), intraocular pressure (IOP), slit lamp and gonioscopic results, ultrasound biomicroscopy (UBM), and optical coherence tomography (OCT) findings were recorded.Results.Cyclodialysis clefts were completely closed postoperatively in four patients (four eyes); this was confirmed by progressively improved VA, restoration into the normal range of the IOP, disappearance of suprachoroidal fluid, and reduced macular edema. Only one patient with multiple clefts had an incomplete reattachment.Conclusions.This clinical study offers a novel and efficient method to localize and repair the cyclodialysis clefts.

scholarly journals Is 20/20 vision good enough? Visual acuity differences within the normal range alter performance on contour grouping tasks

2014 ◽  
Vol 14 (10) ◽  
pp. 64-64
Author(s):  
D. Paterno ◽  
B. Keane ◽  
S. Kastner ◽  
S. Silverstein
Keyword(s):  
Visual Acuity ◽  
Normal Range ◽  
Contour Grouping

Special Visual Assessment Techniques for Multiply Handicapped Persons

1991 ◽  
Vol 85 (1) ◽  
pp. 23-29 ◽  
Author(s):  
A. Hall ◽  
D. Orel-Bixler ◽  
G. Haegerstrom-Portnoy
Keyword(s):  
Visual Acuity ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Visual Fields ◽  
Visual Assessment ◽  
Special Populations ◽  
Assessment Techniques ◽  
Major Emphasis ◽  
Ocular Health ◽  
Multihandicapped Persons

Techniques to assess vision capabilities of multihandicapped persons are discussed as used in a specialty Optometric clinic. The major emphasis of the assessment is to obtain information about visual abilities and to make recommendations that promote optimum vision functioning. Techniques for working with children from special populations are discussed. The assessment includes a modified ophthalmic examination to identify and correct refractive error and to assess oculomotor functioning and ocular health. Visual acuity is measured using preferential looking and visual evoked potential techniques. Confrontation visual fields are measured. Several aspects of visual function are assessed with a parent interview.

SYSTEM FOR MEASURING RODENTS' VISUAL FUNCTION: DESIGN AND IMPLEMENTATION

2014 ◽  
Vol 26 (02) ◽  
pp. 1450018 ◽  
Author(s):  
Carlos Perez-Vidal ◽  
Alejandro Garcia ◽  
Nicolas Garcia-Aracil ◽  
Jose M. Sabater ◽  
Eduardo Fernandez
Keyword(s):  
Computer Vision ◽  
Visual Acuity ◽  
Visual Perception ◽  
Contrast Sensitivity ◽  
Visual Function ◽  
Histological Analysis ◽  
Visual Development ◽  
New Drugs ◽  
Design And Implementation ◽  
Function Design

The aim of the work presented in this paper is the design, manufacturing and assembling of a system able to measure rodents' (mice and rats) visual function and to study the evolution of degenerative retina diseases. Measurement of contrast sensitivity and visual acuity is essential to design new drugs and understand mechanisms of visual development to evaluate treatments' effectiveness. Classical methods to study visual perception of animals such as electroretinogram (ERG) or histological analysis are not supplying enough information because connection between eyes and brain is not considered. The system proposed in this work consists of four screens forming a cube with black methacrylate plastic floor and roof. Screens display visual stimulus and the rodent's behaviour (placed over a platform in the middle of the cube) is analized to determine its visual acuity and contrast sensitivity. These visual stimuli are generated from a FPGA board designed in this project. This board has a USB link with a computer and it controls screens via VGA signals. Rodents' behaviour is analized using computer vision algorithms under OpenCV libraries. To test the system, more than 30 mice (C57 and RD10 type) have been used to validate the hardware, the software, the procedure and protocol.

Large-Scale LOD Adaptive Terrain Rendering

2012 ◽  
Vol 220-223 ◽  
pp. 2450-2453 ◽  
Author(s):  
Wen Long Yu ◽  
Li Min Zhang ◽  
Bing Qiang Zhang
Keyword(s):  
Visual Acuity ◽  
Visual Perception ◽  
Large Scale ◽  
Dynamic Error ◽  
Smooth Transition ◽  
Evaluation Function ◽  
Static Error ◽  
Terrain Rendering ◽  
Quad Tree ◽  
Screen Space

The data structure is the form of quad-tree in this paper. The terrain node's LOD evaluation function is given through comprehensive considering the three factors which are the static error of the terrain block ,the screen space dynamic error and visual perception based on the premise of visual acuity. The smooth transition factor is used to eliminate the phenomenon of popping in the GPU vertex shader. The idea to join the skirts is used to eliminate cracks between terrain blocks. The experimental results show that the algorithm can reflect the terrain LOD levels through the fluctuant of terrain and the visual perception intensity so that the terrain has a better adaptability while increasing frame rates and rendering realistic.

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