Human eye The upper end of the range is given in terms of normal visual performance as 10 cd/m (100,000,000 or one hundred million candelas per square meter). The eye includes a lens similar to lenses found in optical instruments such as cameras and the same physics principles can be applied. The pupil of the human eye is its aperture; the iris is the diaphragm that serves as the aperture stop. Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter. The entrance pupil is typically about 4 mm in diameter, although it
Daisy (given name) Daisy (given name) Daisy is a feminine given name, commonly thought to be derived from the name of the flower. The flower name comes from the Old English word "dægeseage", meaning "day's eye". The name Daisy is therefore ultimately derived from this source. Daisy is also a nickname for Margaret, used because "Marguerite", the French version of that name, is also a French name for the oxeye daisy. It came into popular use in the late Victorian era along with other flower names. Authors Linda Rosenkrantz and Pamela Redmond Satran wrote in their 2007 book "Baby Name Bible" that Daisy