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
As the Flower Withers As the Flower Withers As the Flower Withers was the first album by Yorkshire-based doom metal band My Dying Bride. The artwork was designed by Dave McKean. This is the only full-length My Dying Bride album on which lead vocalist Aaron Stainthorpe utilizes his trademark death growl as the sole vocal style. Many of the tracks on this album have appeared in a different form on other My Dying Bride releases. "Sear Me" was the first in a trilogy of songs to bear the title, followed by the keyboard- and violin-only "Sear Me MCMXCIII" in 1993 and "Sear Me III"