By W.A. Douthwaite, MSc PhD FBCO DCLP (Auth.)
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Extra info for Contact Lens Optics and Lens Design
Thus there are a number of interrelated factors which influence the ﬁnal outcome of the power of the correction. In the clinical situation, it is good practice to perform the over-refraction using the lens expected BVP ( BVP equal to the ocular refraction mean sphere) and a lens speciﬁcation identical to that to be ordered for the eye in question. 40 mm is used for an over-refraction. 00 DS is interposed at a vertex distance of 12 mm from the contact lens. 75 mm is ordered? 00 DS at the contact lens as follows.
450. 336. 10 D as they cross the contact lens/fluid lens interface. There is a computer program in Chapter 11 which performs this calculation for media of any refractive index. 1 Contact lens dimensions, symbols and suggested abbreviations Dimension Symbol Suggested abbreviation Back optic zone radius r0 BOZR Back peripheral radius r1, r2, r3, etc. BPR1, BPR2, BPR3 Front optic zone radius ra0 FOZR Front peripheral radius ra1, ra2, etc. FPR1, FPR2, etc. Back optic zone diameter f0 BOZD Back peripheral zone diameters f1, f2, f3, etc.
It will be recalled that myopes accommodate more, hyperopes accommodate less, when wearing contact lenses instead of a spectacle correction. This means that the accommodation–convergence ratio is only minimally disturbed. 9 Summary 1. Vergence in dioptres is the reciprocal of distance in metres and vice versa. 2. Convergence is positive, divergence is negative. A positive vergence will be accompanied by a positive distance. Divergence will be accompanied by negative distances. 3. Hyperopes need more powerful contact lenses.