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 in 1999, which is more similar in style to the original, being a full band composition. "The Bitterness and the Bereavement" evolved from an earlier demo, which was released independently as "Unreleased Bitterness" in 1993. This version of the song also appears on the digipak re-release of "As the Flower Withers", and on the rarities/best-of compilation "Meisterwerk 1". "Vast Choirs" is a reworked version of the version that appears on the band's first recording, "Towards the Sinister". This version is widely available on both "Meisterwerk 2" and the 2004 reissue of "Trinity". "The Return of the Beautiful" was re-recorded for