Back to Search
Start Over
Comparison of fixation disparities obtained by objective and subjective methods
- Source :
- Vision Research. 38:411-421
- Publication Year :
- 1998
- Publisher :
- Elsevier BV, 1998.
-
Abstract
- Fixation disparities (FD) were measured as a function of forced vergence using binocular scleral search coils and simultaneously with nonius lines. The slope of the objective FD curve was significantly greater than the subjective FD curve for three of five subjects. This indicates an alteration in retinal correspondence of up to one degree, that shifts Panum's area to avoid the diplopia normally present with large disparities. This process allows for fusion in the presence of large objective fixation disparities which would normally cause diplopia. The shift in correspondence enhances the range of forced vergence, since the larger objective FDs serve as more effective stimuli to fusional vergence. The remaining subjects who lacked this effect had "flat" FD curves indicative of high vergence adaptation.
- Subjects :
- Adult
Vision Disparity
genetic structures
Fixation, Ocular
Models, Biological
law.invention
Optics
law
Methods
medicine
Humans
Diplopia
Measurement method
business.industry
Fusional vergence
Convergence, Ocular
Nonius
Sensory Systems
Retinal correspondence
Ophthalmology
Fixation (visual)
Optometry
medicine.symptom
business
Psychology
Binocular vision
Mathematics
Subjects
Details
- ISSN :
- 00426989
- Volume :
- 38
- Database :
- OpenAIRE
- Journal :
- Vision Research
- Accession number :
- edsair.doi.dedup.....6fe64efe7e173f6860449cc49ae2ebec