In the bright light, pupils constrict (narrow) to prevent too much light from entering the eye and causing a "white out." The pupil is not the same thing as the iris, the colored structure behind the ...

The centre of the lens is called the optical centre C. In a ray diagram, a converging lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens. Point the lens ...

They noticed that people with tinnitus showed small facial twitches and wider pupil dilation in response to certain noises. This is the first time researchers have found physical signs that could ...

The pupillary dilation caused by phenylephrine and tropicamide can be reversed with dapiprazole hydrocloride (Rev-Eyes™, Storz Ophthalmic, a division of Bausch & Lomb, Rochester, NY) Dapiprazole ...

A 19-month-old boy attended the paediatric assessment unit with asymmetrical pupils. This had first been noticed 8 h previously. The boy had asthma for which he was prescribed both salbutamol and ...

During eye movement task, pupil dilation and constriction patterns occurred repeatedly, wavy curve was produced to display the trajectories of changes in pupil diameter over time. The frequency domain ...

This study presents important findings on the role of pyramidal cells driving vasoconstriction in brain arteries through a COX-2/PGE2 pathway, with additional contributions from NPY (interneurons) and ...