PURPOSE To compare postoperative changes in apparent photopic and mesopic pupil size and centration in relation to cornea reflection landmarks after cataract surgery. SETTING LaserVision.gr Clinical and Research Eye Institute, Athens, Greece. DESIGN Prospective consecutive case study. METHODS Pupils were imaged for pupil size and corneal vertex location before and 1-month after cataract s...

OBJECTIVES To determine if acupuncture stimulation elicits a pupillary response under light adaptation and whether there is any difference in the pupillary response between light and dark adaptation environments during acupuncture stimulation. METHODS The participants consisted of 55 healthy individuals who had no known eye diseases or pupil abnormalities. Experiment 1 compared pupillary resp...

AIM To investigate the relationship between neuron density of the superior cervical sympathetic ganglia and pupil diameter in subarachnoid hemorrhage. MATERIAL AND METHODS This study was conducted on 22 rabbits; 5 for the baseline control group, 5 for the SHAM group and 12 for the study group. Pupil diameters were measured via sunlight and ocular tomography on day 1 as the control values. Pup...

PURPOSE The authors examined the circadian change of basal pupil size in light-dark entrained normal rabbits and in entrained rabbits with unilaterally decentralized ocular sympathetic nerves. The pattern of the circadian pupillary rhythm was compared with the circadian patterns of intraocular pressure (IOP) and body temperature in the same rabbits. METHODS Adult male New Zealand albino rabbi...

Purpose We determine the effect of short-term light adaptation on the pupil light reflex and the melanopsin mediated post-illumination pupil response (PIPR). Inner and outer retinal photoreceptor contributions to the dark-adapted pupil response were estimated. Methods In Experiment A, light adaptation was studied using short wavelength lights ranging from subthreshold to suprathreshold irradi...

This thesis investigates the applicability of computer vision camera models in recovering depth information from images, and presents a novel camera model incorporating a modified pupil plane capable of performing this task accurately from a single image. Standard models, such as the ideal pinhole, suffer a loss of depth information when projecting from the world to an image plane. Recovery of ...

Abstract: The Behr Pupil Revisited • Three hundred and sixty-three cases of cerebral infarction were reviewed; 19 had anisocoria. Eighty percent had the larger pupil contralateral to the hemispheric lesion. The mydriasis was associated with long tract signs in all instances. If the abnormal pupil and long tract signs are not on the same side, the long tract signs are the most accurate evidence ...

A computer model that incorporates the monochromatic aberrations of the eye is used to determine the optimal pupil size for axial and lateral resolution as it applies to retinal imaging instruments such as the confocal scanning laser ophthalmoscope. The optimal pupil size for axial resolution, based on the aberrations of 15 subjects, is 4.30 mm +/- 1.19 mm standard deviation (sd), which is larg...

We describe two cases of a unilateral fixed dilated pupil secondary to the ocular instillation of nebulised ipratropium bromide. In one patient there was no other neurological abnormality. The second patient was unconscious following a cardiac arrest. While a fixed dilated pupil is an alarming sign, if it is caused by ocular instillation of ipratropium bromide the condition will resolve, althou...

This paper present a pupil detection/segmentation algorithm for iris images based on Structure Tensor analysis. Eigenvalues of the structure tensor matrix have been observed to be high in pupil boundaries and specular reflections of iris images. We exploit this fact to detect the specular reflections region and the boundary of the pupil in a sequential manner. Experimental results are given usi...