How to Choose the Right Base Curve for Your Eyes

By Contact Lenses Online Malaysia - Coloured & Clear | Published: 2026-10-18

Category: How-to Guides

Learn what base curve means, why it matters for comfort, and how to pick between 8.6mm, 8.7mm, and 8.8mm with practical steps.

Quick Answer

Your base curve is the curvature of the lens that matches your cornea. Most people need 8.6mm or 8.7mm, but the right choice depends on your eye shape and comfort. Always check your prescription or ask an eye care professional before buying.

What Is Base Curve and Why Does It Matter?

Base curve (BC) is the measurement of the inner curvature of a contact lens, expressed in millimeters. It determines how tightly or loosely the lens sits on your eye. A lens with a base curve that's too flat (larger number) may move too much, while one that's too steep (smaller number) can feel tight and cause discomfort.

For colored lenses, getting the base curve right is just as important as the color. If the lens doesn't fit well, it can irritate your eye or even affect vision clarity. That's why many brands, including EyeMuse, offer options like 8.6mm and 8.7mm to accommodate different eye shapes.

How to Find Your Base Curve

Your base curve is usually printed on your contact lens prescription or on the box of your current lenses. It's often listed as 'BC' followed by a number like 8.6 or 8.7. If you don't have it, your eye care professional can measure it during a routine exam.

Never guess your base curve. Wearing lenses with the wrong curve can lead to discomfort, redness, or even corneal scratches. If you're between sizes, your optometrist can help you decide based on your eye's shape and tear film.

Step-by-Step to Choosing Your Base Curve

Check Your Prescription: Look for the 'BC' number on your contact lens prescription or current lens box. This is the base curve your eye care professional has determined fits you best. If you don't see it, contact your optometrist—don't guess.
Understand the Numbers: A smaller number (like 8.6mm) means a steeper curve, while a larger number (like 8.7mm or 8.8mm) means a flatter curve. Most corneas fall within this range, but your exact fit matters. If you're between sizes, your eye care professional can help you choose.
Match the Lens to Your Prescription: When shopping for colored lenses, filter by your base curve. For example, if your BC is 8.6mm, look for lenses with that specification, like the WCX-725 INDIGO EARL GREY. Using the wrong base curve can cause discomfort or poor vision.
Consider Your Comfort: Even with the right base curve, lenses should feel comfortable. If you experience dryness or irritation, it might be a sign that the fit isn't ideal for your eye shape. If discomfort persists, consult your eye care professional.
Try and Evaluate: Once you've selected a lens, wear it for a few hours and notice how it feels. It should stay centered and not move excessively when you blink. If the lens moves too much or feels tight, switch to a different base curve or brand.

Base Curve Options in Our Store

WCX-725 INDIGO EARL GREY: WCX-725 INDIGO EARL GREY from EyeMuse has a base curve of 8.6mm and water content of 38%. If your prescription shows 8.6mm, this lens offers a natural grey tone that's suitable for everyday wear.
WCX-723 GOJI BERRY: WCX-723 GOJI BERRY from EyeMuse has a base curve of 8.7mm and water content of 38%. For those who need a slightly flatter fit, this seasonal lens provides a comfortable option with a distinctive look.