How To Convert Your Contact Lens Prescription To Glasses ... | 合法醫療器材資訊網

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Need to convert your contact lens prescription to glasses?

It’s very simple to do.

First note that below -3.50 diopters you don’t need to make any changes to the diopters between glasses and contact lenses.  Although the net clarity from contact lenses will be slightly higher since they sit closer to your eyes, slightly increasing actual diopters.

Contact Lens To Glasses Conversion – Quick Take

Here’s how you convert contact lenses to glasses:

Any prescription over -3.50 to -4 diopter, and add +0.25 diopters for every two diopters of increase:

4.00 D +0.25 D 6.00 D +0.50 D 8.00 D +0.75 D 10.00 D +1.00 D 12.00 D +1.25 D 14.00 D +1.50 D 16.00 D +1.75 D

So a -4.00 glasses prescription is roughly equal to a -3.75 contact lens prescription.

Here’s a handy chart:

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