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A calculator to quickly and easily convert spectacle Rx to a contact lens Rx and its spherical equivalent
🔎 If you want to calculate vertex compensation for a different lens, not a contact lens (i.e., you're moving your spectacle lens toward or away from your eyes for some reason), enter a non-zero final vertex distance in step 3, and our calculator will yield the results you seek!
D = vertex distance; Fcl = vertexed CL power; Fspec = spectactle rx Minus Spectacle Lens Plus Minus Spectacle Lens Plus 3.75 4.00 4.25 10.50 12.00 14.50
Contact Lens Vertexing Calculator. OD x. OS x. Vertex Distance 12. Submit ...
A calculator to quickly and easily correct spectacle prescriptions for vertex distance to create contact lens prescriptions in optometric practice
These converted values are based on a 12mm vertex distance and are rounded to the nearest hundredth. Generally speaking, you do not need to convert the spherical spectacle prescription to a different dioptric contact lens power if the absolute power of the spectacle is ≤4.00.
3175 3 Mile Road NW, PO Box 1848 Grand Rapids, MI 49501 Phone 800.253.9364 Fax 800.648.2272
CooperVision’s cross-cylinder calculator will help fit your astigmatic patients accurately and efficiently. Start by entering the spectacle and lens prescriptions and over-refraction. Then indicate the lens rotation, direction, and vertex. We’ll recommend a prescription and confirm that it agrees with the original spectacle correction.
This online calculator provides a simple method to adjust a lens power when changes are made to the vertex distance of an optical lens. This adjustment is commonly carried out by an optician when calculating the power of a contact lens, given the spectacle lens prescription.
Our vertex contact lens calculator provides quick results as soon as you input your glasses prescription and vertex distance. This means you get the correct contact lens power right away, without having to wait.