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He is mostly known for his creation of the seven signs that differentiate a religious congregation from a sectarian church, which he created while researching the Church of Scientology.He introduced the distinction between world-affirming and world-rejecting new religious movements.
Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies.
Mammals, birds and reptiles vary the optical power by changing the form of the elastic lens using the ciliary body (in humans up to 15 dioptres).
Fish and amphibians vary the power by changing the distance between a rigid lens and the retina with muscles.
Note that these effects are most noticeable when the pupil is large; i.e. The age-related decline in accommodation occurs almost universally to less than 2 dioptres by the time a person reaches 45 to 50 years, by which time most of the population will have noticed a decrease in their ability to focus on close objects and hence require glasses for reading or bifocal lenses.
Accommodation decreases to about 1 dioptre at the age of 70 years.