How Do You Convert Between Contact Lens Prescription to 20/20 Vision?

My contact lens prescription is -7.5 in both eyes. How can you convert this into the 20/20 type number?

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  1. Unfortunately there is not conversion factor for the two, since seeing 20/20 is subjective and differs from person to person. But there are estimates – for a prescription as high as yours the highest letter on the chart (the big E) is probably unreadable – this means that your vision is worse than 20/400 or >20/400. Hope this helps!

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  3. sugars_that_heal says:

    Your vision will get better with a combination of glyco and phyto

    info on my page

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