Size and distance judgments under reduced conditions of viewing

Distal and proximal size under reduced and non-reduced viewing conditions.

Of the many aspects or properties of objects a person can perceive, the perception of size has loomed large as a field of investigation. A recent review by Epstein, Park and Casey attests to continuing interest in this area.' Early investigations dealt with the processes by which a person perceives the size of an object that accords with its real or distal size. There is ample evidence that a p...

Face Recognition Under Varying Viewing Conditions with Subspace Distance

We present a feature-invariant classification model that recognizes images under various analytic and nonanalytic transformations in the category of face recognition where human faces to be recognized are seen under varying lighting conditions and viewpoints. Our method exploits the idea of tangent approximation to differentiable manifolds, which motivates the use of subspace distance to build ...

A Variety of Size and Distance Judgments under Monocular Observation: Instructions and Individual Differences

Font size and viewing distance of handheld smart phones.

PURPOSE The use of handheld smart phones for written communication is becoming ubiquitous in modern society. The relatively small screens found in these devices may necessitate close working distances and small text sizes, which can increase the demands placed on accommodation and vergence. METHODS Font size and viewing distance were measured while subjects used handheld electronic devices in...

Vergence eye movements under natural viewing conditions.

PURPOSE To determine whether there are any fundamental differences in vergence dynamics under different viewing conditions, both in instrument space and free space. METHODS Symmetric vergence responses were measured for a variety of conditions under the traditional instrument space as well as the more natural free space viewing environment. Vergence eye movements were recorded objectively in ...