Eyeglass prescription contact lens to glasses conversion chart Here s a handy tool. This generally involves using a conversion chart although many eye doctors can do the calculations in their head.
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The reason for this is that a contact lens prescription is in some sense a simplified version of a glasses prescription.
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Begin with the prescription for your right eye the right eye is usually written as o d.
Sphere is usually written as sph make sure to include the symbol in front of this value if plus or the symbol if minus. Basic glasses to contact lens conversion charts. Typically they show the results for both negative and positive power on either side of the chart.
Eye doctors go through several steps to make sure that prescriptions are properly converted before fitting anyone with contact lenses. Once you convert from glasses to contact lenses you lose some information about the original prescription. How to convert your glasses prescription to contacts.
Enter your sphere number into the sphere tab. Using a vertex distance conversion chart to convert a glasses prescription to contact lenses is just the first of many steps involved in getting to the final contact lens prescription. So a 4 00 glasses prescription is roughly equal to a 3 75 contact lens prescription.
Use our spectacle conversion calculator to convert a patient s eyeglasses prescription to the corresponding contact lens parameters. Unfortunately there s no way to accurately determine your glasses prescription from a contact lens prescription. Basic glasses to contact lens conversion charts take a single glasses lens power and show you the converted value for contact lenses.
There are two possible outcomes. Eyeglass prescription positive cylinder conversion. This is because many years ago the instruments used to measure and cut lenses were only able to do so in positive increments.
Every eye is different and every contact lens brand is different. You can do the same for astigmatism correction though it only becomes relevant if the glasses astigmatism is at least 0 75 to 1 diopters otherwise combine cylinder and spherical from the glasses prescription for the contact lens. The fastest way to convert a glasses prescription to contact lenses is simply to look it up on a chart.
Meaning oculus dexter and is placed just above the o s. Converting eyeglass prescription to contact lens before the conversion. The calculator is designed to aid eye care practitioners.
Ophthalmologists and a few older optometrists different types of eye doctors write astigmatism prescriptions with positive cylinders. Remember it s just a mathematical formula spitting out numbers. In some instances where the sphere is the only power in the prescription i e there is no cylinder or axis it would actually be possible to convert a contact lens prescription to glasses.
Here is a classic example that i made when i started contacts. It is not a replacement for a professional contact lens fitting by a qualified eye care practitioner. To go from a contact lens prescription to glasses the sphere power is put through a mathematical equation called the back vertex formula.
Click here to easily look up any prescription once the most appropriate cylinder for the contacts has been determined eye doctors will decide whether or not you ll need contact lenses for astigmatism.
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