If the pupil does not dilate sufficiently with the steps described so far, you can proceed to pupil stretching, using iris hooks, or inserting a pupil-expansion ring. Any of these processes can create a maximum pupillary opening of about the same circumference or perimeter, which means that t...
The Neuronal Model (Sokolov, 1963) considered pupil dilation a mechanism to increase visual acuity when a novel stimulus appears which does not fit a previous neuronal model. On the other hand, according to Kahneman (1973), enlargement of the pupil is caused by the significance of the stimulus...
Cataract surgery in the eyes, where the pupil does not dilate despite using eye drops, is fraught with vision-threatening complications. About 11 per cent of eyes undergoing cataract surgery have non-dilating, small pupils. The increasing prevalence of benign prostatic hyperplasia...
What doespupilmean? Apupilis a person who is learning under a teacher or instructor. In this sense,pupilis often used when the student is young but does not strictly apply to young people. In legal terms,pupilcan refer to a minor who is under the care of a legal guardian who is not...
So using flash photography can mislead as far as measuring the eye’s pupil. And that doesn’t include the problems of prefocusing, as a dark room dark enough to fully dilate the pupil is too dark to autofocus, usually. Oh and let’s not forget perspective that can cause the measurement...
I'm skeptical that my pupil does not fully dilate under light polluted skies. When I compare my 10x50s with my 10 x 70s, I see considerably more stars in M6 and M7 with the larger aperture. Both binos are measured at full aperture. They're low and on the hoizon, the skyglow is ...
pupil可以用作名词 pupil的基本意思是“同学”,指由老师亲自照看和指导的对象,尤指中学校生。在美式英语里, pupil仅指“学校生”。当侧重于从学习的角度或从对老师敬重的角度时, pupil还可指私人老师或学者指导的“门徒,弟子”,此时pupil没有年龄或学历的限制。pupil后面通常接in引起的短语,说明是“哪方面的同学...
A third oculo-motor activity that does not produce rotation of the eyeball is adjustment of pupil diameter. Like blinking, pupil responses have reflexive and voluntary components. The reflexive component is elicited, under normal conditions, by changes in illumination or by an approaching object. Pu...
During phacoemulsification surgery and vitreo-retinal surgery, when the pupil does not dilate with medicated drops, a device is required for mechanical enlargement of the pupil. Such a device has to maintain the pupil in the enlarged state and prevent it from collapsing for the entire duration of...
Thus, the three zone design may not be the optimal for individuals whose pupil does not dilate to 6.0 mm. In those cases, a two zone bifocal design, with a central near vision zone and an annular distance vision zone may be preferable. In this two zone design, if the central one ...