THEORETICAL EFFECT OF REFRACTIVE ERROR AND ACCOMMODATION ON LONGITUDINAL CHROMATIC ABERRATION

Title THEORETICAL EFFECT OF REFRACTIVE ERROR AND ACCOMMODATION ON LONGITUDINAL CHROMATIC ABERRATION
Author, Co-Author David Atchison, George Smith, Michael Waterworth
Topic
Year
1992
Day
Monday
Program Number
2:30 pm
Room
Ireland B
Affiliation
Abstract Because chromatic aberration is considered to be a possible factor affecting emmetropization and the accommodation response, we developed simple formulas based on reduced-eye models to predict the variation in longitudinal chromatic aberration with variation in ametropia or accommodation. Two formulae were developed, one for axial ametropia and one for refractive ametropia. The latter also served as a model for accommodation. The results using the formulas are in close agreement with results obtained using raytracing through more sophisticated models. Predictions of changes in longitudinal chromatic aberration, between wavelengths of 400nm and 700nm, with change in each diopter of refractive error or accommodation are: axial ametropia 0.012D, refractive ametropia and accommodation 0.05D. Myopes have greater aberration than hypermetropes, and aberration increases with increasing accommodation. As the longitudinal chromatic aberration of the eye is approximately 2.1D between 400nm and 700nm, the predicted changes would seem to be too small to affect emmetropization or the accommodation response.
Affiliation of Co-Authors
Outline