Vision research.
Publisher:
Elsevier Science Ltd.. Kidlington, Oxford : Elsevier Science Ltd.
Frequency: Twenty-eight no a year, 2000-
Country: England
Language: English
Start Year:1961 -
ISSN:
0042-6989 (Print)
1878-5646 (Electronic)
0042-6989 (Linking)
1878-5646 (Electronic)
0042-6989 (Linking)
Impact Factor
1.8
2022
| NLM ID: | 0417402 |
| (DNLM): | V08220000(s) |
| (OCoLC): | 01589794 |
| Coden: | VISRAM |
| LCCN: | 64009802 |
| Classification: | W1 VI84 |
Local and global stereopsis in the horse. Although horses have laterally-placed eyes, there is substantial binocular overlap, allowing for the possibility that these animals have stereopsis. In the first experiment of the present study we measured local stereopsis by obtaining monocular and binocular depth thresholds for renal depth stimuli. On all measures, the horses' binocular performance was superior to their monocular. When depth thresholds were obtained, binocular thresholds were several times superior to those obtained monocularly, suggesting that the animals could use stereoscopic information when it was available. The binocul...
Visual acuity in the horse. We assessed the ease with which horses could learn visual discriminations and measured their resolution acuity. We trained three horses to press their noses against one of two large wooden panels to receive a small food reward. Following training on a series of two-choice discrimination tasks, resolution acuity was measured. Although there was some variability between animals, the best acuity obtained was 23.3 c deg-1. Within the margin of error imposed by limited anatomical data, the obtained values are consistent with predictions based on retinal ganglion cell density estimates and posterior...
The optics of comparative ophthalmoscopy. One factor peculiar to the practice of comparative ophthalmoscopy is the very large variation in ocular size of the animals examined, a factor which is ignored in current textbook treatments of the subject. We have computed values of lateral magnification, axial magnification, angular field of view and linear field of view for 19 species of terrestrial vertebrates. The dimensional value of a 1 diopter change in direct ophthalmoscopic focus was also determined. The anterior focal length of the eye in air and the vitreal refractive index were the intrinsic optical parameters of the animal's eye ...