A5103028563- Visual perception and processing mechanisms
- Ophthalmology and Visual Impairment Studies
- Muscle activation and electromyography studies
- Motor Control and Adaptation
- Corneal surgery and disorders
- Color perception and design
- Gaze Tracking and Assistive Technology
- Spatial Cognition and Navigation
- Ophthalmology and Eye Disorders
- Ocular and Laser Science Research
- Neural dynamics and brain function
- Retinal Imaging and Analysis
- Neurobiology and Insect Physiology Research
- EEG and Brain-Computer Interfaces
- Glaucoma and retinal disorders
- Color Science and Applications
- Ergonomics and Musculoskeletal Disorders
- Tactile and Sensory Interactions
- Retinal Diseases and Treatments
- Virtual Reality Applications and Impacts
- Ocular Surface and Contact Lens
- Facial Trauma and Fracture Management
- Surgical Simulation and Training
- Impact of Light on Environment and Health
- Sport Psychology and Performance
Leibniz Institute of Environmental Medicine
2023-2025
Marshall B. Ketchum University
2008-2023
Queensland University of Technology
1994-2010
University of California, Berkeley
1988-2005
SUNY College of Optometry
1995-2004
Graduate Theological Union
2003
Victoria Park
2002
State University of New York
2000-2002
University of California System
1968-1997
University of Alabama in Huntsville
1996
A method to identify statistical dependencies in the positions of eye fixations is developed and applied movement data from subjects who viewed dynamic displays air traffic judged future relative position craft. Analysis approximately 23 000 on points interest display identified scanning that were independent physical placement interest. Identification these inconsistent with random-sampling-based theories used model visual search information seeking.
The minimally invasive nature of endoscopic surgery allows operations to be performed through small incisions, producing significantly less damage good tissue than in conventional open surgery. Patient recovery times are thus greatly reduced. This major advantage has driven a dramatic growth techniques wide range surgical applications. Unfortunately, the surgeon's abilities severely hampered by limitations current technology. In many ways is similar teleoperation remote manipulator. Although...
Accommodative amplitude decreases with age, not aging. The decrease is largely completed by age 40 years; only minor residual accommodation present in most subjects after the mid-40s. dynamical measurements show accommodative response of over 30 years to be significantly slowed (time constants increases). Accommodation less than 3 D age. Thus prepresbyopia a sign continual development, deterioration mechanism. Accommodation, or change clear vision lens power, has been studied many...
Despite growing awareness of endocrine disrupting chemicals (EDCs), knowledge gaps remain regarding their effects on human brain development. EDC risk assessment focuses primarily EATS modalities (estrogens, androgens, thyroid hormones, and steroidogenesis), overlooking the broader range hormone receptors expressed in developing brain. This limits evaluation for potential to cause disruption-mediated developmental neurotoxicity (ED-DNT). The Neurosphere Assay, an vitro test method (DNT)...
Three young adult females with symptoms related to focusing difficulties at near were treated by standard orthoptic procedures, including jump focus, plus-and-minus lens flippers, and pencil pushups. Home training was done 20 minutes each day for 4½-7 weeks. Objective measures of dynamic accommodation made week in our Neuro-optometry Clinic. Initially, these objective showed prolongations time constants latencies accommodation. During treatment, the patients significant reductions that...
We show the presence of a new nonlinearity in accommodation dynamics. Positive is slower when eye operating near range; conversely, relaxation apparently during work far range. Latency unaffected by working This dynamic range has been defined connection with continuing research study responses normal subjects and clinic patients. Instrumentation analysis procedures are described.
High-speed photography of eyeblinks in 4 subjects provided displacement and velocity time functions. The results from dynamic measurements made with a mechanical transducer connected physically to the upper eyelid gave estimates passive spring constant (Kp = 1.5 gmf/mm) viscosity (Bp 0.09 gmf - sec/mm) eyelid. Noting similarity between reciprocal-innervation mechanisms eye-movement systems, mathematical model was derived based on well-known using similar ideal mechanical-element...
An optometer is described that provides an electrical signal proportional to the amount of movement anterior surface crystalline lens. Dynamic recordings this were made on a number subjects tracking predictable (periodic) and nonpredictable target step movements. Histograms reaction times definitely show accommodation system can reduce its delay time when presented with stimulus. Typical accommodative are compared those published by other authors in literature. The change chamber depth, lens...
The many mutually interacting phenomena which control cerebrospinal fluid dynamics and reflect them to other physiologic systems constitute a rather complex mechanism. classical piecemeal approach for analysis is not suited study the interactions of multiple parameter changes or manner in some evoked change system reflects itself on parts
We wished to determine how pupil size and mean accommodation response level interact influence the fluctuations of accommodation. A dynamic infra-red optometer was used record responses while subjects viewed a steady target at two stimulus levels (1.5 3 D) through four pupils (1, 2, 4 6 mm). It found for most that increase higher levels, small lead an in low frequency (but not high frequency) The effects are independent size, level.
It has been suggested that in the presence of astigmatism some individuals make cyclic changes focus over astigmatic interval to obtain better visual performance. The aim present study was identify such accommodative behavior and characterize variability response astigmatism. dynamic accommodation induced recorded objectively with an infrared optometer seven young adults. Astigmatism led directly increased certain individuals. In two participants there evidence for aperiodic responses...