By W.A. Douthwaite, MSc PhD FBCO DCLP (Auth.)
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Additional resources for Contact Lens Optics and Lens Design
40 mm. 00 D to correct the myopia. 74 mm. 336. 16 shows a section of Heine’s scale. The scale is used to convert radius to surface power or surface power to radius. 336. 05 mm This allows accurate calculation of the fluid lens surface power changes with change of radius avoiding the errors arising from using the approximate rule.
In practice an optometrist decides on a suitable back optic zone radius (BOZR) in order to ensure an acceptable ﬁt. S/he goes on to perform a contact lens overrefraction in order to deduce the contact lens BVP to be ordered. The contact lens laboratory must, in manufacturing the lens, provide it with the correct BOZR and deduce the front surface radius required to provide the BVP requested. The calculation of front surface radius in these circumstances may best be illustrated by the following example.
13 is generally more forgiving than rigid materials when worn, so the wider dimensional tolerances do not influence clinical performance. Overall, the precision of soft lens manufacture is not as high as that of rigid lenses but that is not clinically signiﬁcant due to the different ﬁtting characteristics of the products. 1 Power changes of soft lenses If a soft lens is placed on a particular eye it will warp into a steeper form so that the back surface takes up the curvature of the cornea on which it rests.