The Ultimate Guide to Converting Your Glasses Prescription to Contact Lens Prescription

Hey there, eyewear enthusiast! ? If you've ever wondered how to transition from glasses to contacts, you're in the right place. We're diving deep into the world of optics to help you make that switch seamlessly. Let's get started!

Why Convert Your Prescription?

Glasses and contact lenses, though both vision correction tools, have different ways of sitting on or in front of your eyes. This means the way they correct your vision can vary. So, while your glasses prescription provides a great starting point, it's essential to convert it accurately for contact lenses to ensure clear, comfortable vision.

Step-by-Step Guide to Conversion

1. Know Your Terms: 

OD (Oculus Dexter): Refers to your right eye.

OS (Oculus Sinister): Refers to your left eye.

Sphere (SPH): Indicates the lens power needed to correct nearsightedness or farsightedness.

Cylinder (CYL): Denotes the lens power for astigmatism.

Axis: Specifies the orientation of the astigmatism.  

2. Start with Your Right Eye (OD):

 Input the sphere value from your glasses prescription. Remember to include the '+' or '-' sign as appropriate.

If you have a cylinder value, input it next. If your cylinder value has a '+', you'll need to convert it to its '-' form.

Enter the axis value if you have one. 

3. Repeat for Your Left Eye (OS).  

4. Hit Calculate! ?

 Voila! You now have your contact lens prescription. 

Ready to Convert? ?

For a seamless conversion using the Optiexpert™ tool, click here and input your glasses prescription.
If you prefer the Bausch + Lomb method, head over here to get started.




 Why can't I use my glasses prescription directly for contacts?

Glasses sit a few millimeters away from your eyes, while contacts sit directly on the eye's surface. This difference in distance means the lens power required can vary. 

 What if I have astigmatism?

If you have astigmatism, you'll need toric contact lenses. Ensure you input both the cylinder and axis values correctly when converting your prescription. 

 Can I use this method for multifocal contact lenses?

No, this guide is not intended for multifocal contact lenses. Consult with an optometrist for those. 

 How often should I update my prescription?

Regular eye check-ups are essential. It's recommended to have your eyes checked annually or as advised by your optometrist.