Tonic accommodation, cognitive demand, and ciliary muscle innervation.

@article{Bullimore1987TonicAC,
  title={Tonic accommodation, cognitive demand, and ciliary muscle innervation.},
  author={Mark A. Bullimore and Bernard Gilmartin},
  journal={American journal of optometry and physiological optics},
  year={1987},
  volume={64 1},
  pages={
          45-50
        }
}
An infrared optometer was used to investigate the relation between cognitive induced shifts in tonic accommodation (TA) and ciliary muscle innervation. Twenty emmetropic men volunteers took part in a double-masked protocol which involved high (a reverse counting task) and low levels of mental load and blocking of sympathetic innervation of the ciliary muscle with the nonselective beta receptor antagonist timolol maleate (0.5%). The high level of cognitive demand induced shifts in TA of up to +1… CONTINUE READING
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