Pulfrich phenomenon

Pulfrich phenomenon

(pul'frik),
the binocular perception that a small target oscillating in the frontal plane is moving in an elliptic path; seen when one eye is covered by a filter or in the presence of a unilateral optic neuropathy.

Pul·frich phe·nom·e·non

(pŭl'frik fĕ-nom'ĕ-non)
The binocular perception that a small target oscillating in the frontal plane is moving in an elliptic path seen when one eye is covered by a filter or in the presence of a unilateral optic neuropathy.

Pulfrich phenomenon

(poolf′rik)
[Carl Pulfrich, Ger. physicist, 1858–1927]
An alteration in depth perception that occurs when one eye receives light from a moving object earlier than the other eye. The moving object appears to be closer to or further from the viewer than it actually is.
References in periodicals archive ?
Additional associated clinical findings include: a reduction in vision in bright light; Uhthoff's phenomenon, exercise- or heat-induced exacerbation of visual symptoms described in 50% of patients with isolated ON; (23) and the Pulfrich phenomenon, in which anomalous perception of the direction of movement of an object occurs due to asymmetry of conduction velocity in the optic nerves.
Despite evidence that the majority of patients recover good vision based on objective parameters, many patients commonly complain of residual deficits in vision, (69) colour vision, (70) contrast sensitivity and difficulty with depth and motion perception, the latter due to the Pulfrich phenomenon.
It is important to realise that when a patient suffers from even low grade Pulfrich phenomenon effects, it causes modification to their spatial awareness and praxis.
Strabismus is often a sign of the Pulfrich phenomenon and can be treated successfully in these cases.