Copyright 2004 Ken Greenebaum
Lens summary
nWhen relaxed
nLongest focal length
n(focus at infinity?)
nWhen tensed
nShortest focal length
n(focused on close objects)
nAccommodation: Ability to stretch
nElasticity reduces with age
nYoung children lens accomodates from 10 to 30
diopters
nAfter 45: lens largely inelastic