Abstract Factors associated with edge clearance in the contact lens‐corneal relationship are peripheral curve radius and width, lens diameter, and corneal shape. The effect of each parameter is quantified, permitting an examination of current design practices. Recommendations are that minor adjustments be made by changing radius, that major adjustments be made by changing width, and that the peripheral curve radius should be steepened as the diameter increases.
Malcolm M. Bibby (Mon,) studied this question.