Spherical Equivalent Charts

by | posted in: Contacts Advice, Conversion Resources | 2

Welcome to Contacts Advice’s Spherical Equivalent Charts.

Here you will find the Spherical Equivalent of every Sphere and Cylinder combination between Sphere values of 0 to -7.75 and Cylinder values of 0 to -3.25.

The charts are based on the following spherical equivalent formula: Spherical Equivalent = Sphere + ( 1/2 * Cylinder )

Contacts Advice Medical Disclaimer

Sponsored Links

Spheres 0 to -0.75

Spherical Equivalent Chart Sphere 0 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -0.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -0.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -0.75 Cylinder 0 to -3.25

Spheres -1.00 to -1.75

Spherical Equivalent Chart Sphere -1.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -1.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -1.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -1.75 Cylinder 0 to -3.25
Sponsored Links


Spheres -2.00 to -2.75

Spherical Equivalent Chart Sphere -2.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -2.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -2.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -2.75 Cylinder 0 to -3.25

Spheres -3.00 to -3.75

Spherical Equivalent Chart Sphere -3.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -3.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -3.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -3.75 Cylinder 0 to -3.25
Sponsored Links


Spheres -4.00 to -4.75

Spherical Equivalent Chart Sphere -4.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -4.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -4.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -4.75 Cylinder 0 to -3.25

Spheres -5.00 to -5.75

Spherical Equivalent Chart Sphere -5.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -5.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -5.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -5.75 Cylinder 0 to -3.25
Sponsored Links


Spheres -6.00 to -6.75

Spherical Equivalent Chart Sphere -6.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -6.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -6.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -6.75 Cylinder 0 to -3.25

Spheres -7.00 to -7.75

Spherical Equivalent Chart Sphere -7.00 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -7.25 Cylinder 0 to -3.25
Spherical Equivalent Chart Sphere -7.50 Cylinder 0 to -3.25 Spherical Equivalent Chart Sphere -7.75 Cylinder 0 to -3.25

Related Posts:

2 Responses

  1. Jalal
    | Reply

    Hi there
    I have Keratoconus and a glasses RX of:
    OD: Sp -2.25 Cy -6.5 Ax +10
    OS: -2.0 -6.0 +165
    I used to use my prescribed hard GP lenses happily until one of them broke and I want to order a pair of new ones.
    Returning to glasses is painfully driving me mad due to the better sight that I had with my contact lenses despite the dust and carrying of artificial tear drops.
    Is this Syl+Cyl(1/2) what doctors use to prescribe hard GPs?

    • Julie
      | Reply

      Hello Jalal,

      I’m not an expert on keratoconus, but from my understanding of the condition, it is when the cornea gets thinner is certain places cause it to become misshapen. The new shape is ‘irregular’ and as a result, the cornea can no longer perfectly focus light, even when glasses or soft contact lenses are worn.

      The reason why people with keratoconus can see so well with hard GP lenses is that the contact lens covers the irregular part of the cornea and creates a new ‘regular’ surface which is capable of perfectly focusing light.

      When eye doctors fit someone into GP contact lenses for keratoconus, they spend a lot of time and attention finding the appropriate diameter and base curve so the lenses centre well and don’t cause damage to the cornea. Once the correct fitting parameters are found, it is then that your eye doctor will determine what prescription to put in them. The numbers will likely have very little to do with your original glasses prescription because the hard GP lenses are creating a new spherical surface and essentially masking all of the irregualr astigmatism.

      DISCLAIMER

      This information is provided as an information resource only (i.e., this is not medical advice) and is not to be used or relied on for any diagnostic or treatment purposes. This information does not create any patient-doctor relationship, and should not be used as a substitute for professional diagnosis and treatment.

Leave a Reply