This paper presents a mathematical model by which successful ellipsoidal back surface hard contact lenses can be predicted. By treating the corneal surface as being ellipsoidal in nature, the amount of lens standoff along the anterior-posterior axis was calculated in both the vertical and horizontal meridians, and for an average of the two meridians. The vertical standoff data showed a grouping of the successful lenses that was statistically significant at the .005 level of confidence. Neither the horizontal nor the average standoff data showed groupings that were statistically significant.
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