You have probably heard of the term “contact lens prescription” whether you’re considering contact lenses for the first time—or you’re making the transition from glasses—you’ve probably heard the term and wondered how it’s different from your regular eyeglasses prescription. At Malaya Optical, we’re here to make it all clear for you.
This guide breaks down the key parts of a contact lens prescription, compares it with your glasses prescription, and teaches you how to read it. Let’s get started!
What Is a Contact Lens Prescription?
A contact lens prescription is a specialized document that includes measurements tailored to the shape and surface of your eyes. It ensures your contact lenses fit properly, feel comfortable, and provide clear vision. Unlike glasses, contacts sit directly on your eye—so the prescription needs to be more precise.
Understanding Your Contact Lens Prescription: Key Terms
Here are the most common parameters you’ll see on your contact lens prescription:
- Power (PWR/SPH) – This corrects nearsightedness or farsightedness. A minus (–) sign indicates nearsightedness; a plus (+) sign indicates farsightedness.
- Base Curve (BC) – This indicates how curved the lens should be to fit the shape of your eye. A proper BC ensures comfort and good vision.
- Diameter (DIA) – This is the width of the lens. It affects how the lens sits on your eye.
- Brand/Material – Contact lens prescriptions are brand-specific. Different materials offer varying levels of oxygen permeability, moisture retention, and comfort. Some trusted brands we carry include:
- Bausch and Lomb
- Air Optix HydraGlyde
- Acuvue Oasys
- Acuvue Moist Daily 30
- And many more at shop.malayaoptical.com
- Cylinder (CYL), Axis, and ADD – These are additional values for people with astigmatism or presbyopia, and apply only when needed.
Glasses vs Contact Lens Prescription: What’s the Difference?
You might assume your glasses prescription can be used to buy contact lenses—but that’s not the case. Here’s why:
| Parameter | Glasses | Contacts |
|---|---|---|
| Distance from eye | Sits on your nose | Rests on your cornea |
| Base Curve (BC) | Not included | Required |
| Diameter (DIA) | Not included | Required |
| Brand Specific | No | Yes |
| Fitting Required | No | Yes |
Bottom line: You’ll need a separate contact lens exam and fitting to get the right prescription.
Do Contact Lens Prescriptions Expire?
Yes! In Malaysia, contact lens prescriptions typically expire after one year. Your eye health can change, and even if your vision seems stable, the fit of your lenses may not be. Regular eye exams ensure you’re wearing the safest, most effective lenses for your eyes.
How to Read Your Contact Lens Prescription
Here’s a sample prescription and what each part means:
| Parameter | Value | Meaning |
|---|---|---|
| OD (Right Eye) | -2.50 | You’re nearsighted in the right eye |
| OS (Left Eye) | -2.00 | You’re slightly less nearsighted in the left eye |
| BC | 8.6 | The base curve of your lens |
| DIA | 14.2 | The lens diameter |
| Brand | Acuvue Moist Daily | Your specific approved lens |
Remember: your optometrist selects the right combination of all these values during a proper fitting.
Still Have Questions? We’re Here to Help
Whether you’re new to contact lenses or you’re finally ready to make the switch from glasses, our friendly, qualified optometrists at Malaya Optical can guide you every step of the way. We offer thorough eye exams and precise contact lens fittings to ensure maximum comfort and clarity.
You can explore trusted lens brands like Bausch and Lomb, Alcon, Acuvue, and more at shop.malayaoptical.com.
Need help understanding your prescription?
Book an appointment with us and let’s get your eyes the care they deserve.