Loss of Grasp

Depth Perception and Grasp in Central Field Loss

PURPOSE We set out to determine whether individuals with central field loss benefit from using two eyes to perform a grasping task. Specifically, we tested the hypothesis that this advantage is correlated with coarse stereopsis, in addition to binocular summation indices of visual acuity, contrast sensitivity, and binocular visual field. METHODS Sixteen participants with macular degeneration ...

Grasp.

Grasp Invariance

This paper introduces a principle to guide the design of finger form: invariance of contact geometry over some continuum of varying shape and/or pose of the grasped object in the plane. Specific applications of this principle include scaleinvariant and pose-invariant grasps. Under specific conditions, the principle gives rise to spiral shaped fingers, including logarithmic spirals and straight ...

Grasp Functions

When manipulating parts, it is important to determine the orientation of the part with respect to thegripper. This orientation may not be known precisely or may be disturbed by the act of grasping. It isin some cases possible to use mechanical compliance to orient parts during grasping. It was recentlyshown [14] that any part with polygonal boundary can be oriented and grasped i...

Effective Application of Grasp

A greedy randomized adaptive search procedure (GRASP) is an iterative multistart metaheuristic for difficult combinatorial optimization. Each GRASP iteration consists of two phases: a construction phase, in which a feasible solution is produced, and a local search phase, in which a local optimum in the neighborhood of the constructed solution is sought. Since 1989, GRASP has been applied to a w...