Contact Lens Vertexing Chart

Contact Lens Vertexing Chart – Vertex conversion is a calculation that compensates for the change in prescription when you go from eyeglasses to contact lenses. The lens powers are rounded to the nearest 0.12 d. The chart below demonstrates the importance of vertex distance compensation while fitting contact lenses. You can determine lens power by taking a patient's spherical equivalent from his spectacle rx and correcting for vertex distance.

You want to provide the best fit, comfort and visual acuity for all your patients that wear contact lenses. Use a vertex conversion chart or slide to calculate the contact lens power example spectacle rx: +6.00 sphere contact lens rx: If the numbers on the prescription you are trying to convert falls within the ranges above, you can use contacts advice’s vertex.

Contact Lens Vertexing Chart

We can use this formula to solve for f2 whether it is from spectacle rx to contact lens. Fcl = vertexed cl power; 3175 3 mile road nw, po box 1848 grand rapids, mi 49501 phone 800.253.9364 fax 800.648.2272

= 1 − ( ) = vertex distance; You can look this up on a table such as the one that appears in the contact. Depending on how far the lens sits from your.

Fc + ft = rx contact lens cornea tear lens generally, the value of rx is the back vertex power of the spectacle lens, vertexed down to compensate for the distance t to the. The diameter of the colored iris should be 2mm to. Convert corneal curvatures from diopters to mm (and vice versa;

[1] vertex distance is important when converting between contact lens and glasses prescriptions and becomes significant if the glasses prescription is beyond ±4.00 diopters. Vertex a refraction to calculate a contact lens power; Visual acuity and expected refractive error, a complete dioptric conversion table and keratometry conversion table, and contact lens vertexing tables are included.

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