8.6mm vs 8.7mm Contact Lenses: How to Choose the Right Fit
By Contact Lenses Online Malaysia - Coloured & Clear | Published: 2026-10-24
Category: How-to Guides
Learn the key differences between 8.6mm and 8.7mm base curve contact lenses. Follow these steps to check your prescription, assess comfort, and pick the right size for your eyes.
Quick answer
Choose the base curve that matches your eye’s curvature: 8.6mm for steeper corneas and 8.7mm for flatter ones. Always verify your prescription or try both sizes if you’re unsure.
Why base curve matters for comfort and vision
The base curve (BC) is the curvature of the lens that sits against your eye. A mismatch can cause the lens to feel too tight or too loose, leading to discomfort, blurred vision, or even lens movement issues. While 8.6mm and 8.7mm are close, the difference is enough to affect how the lens fits.
Trade-offs: tight vs. loose fit
An 8.6mm lens (steeper curve) grips the eye more firmly. This can be good for active wearers but may feel tight if your cornea is flatter. An 8.7mm lens (flatter curve) allows more tear exchange and may feel looser, but if your cornea is steeper, it might shift too much. Neither is inherently better—it depends on your individual eye shape.
How to choose between 8.6mm and 8.7mm lenses
- Check your current prescription or eye exam report: Look for the base curve (BC) value on your contact lens box or prescription. If it says 8.6, choose 8.6mm lenses. If it says 8.7, choose 8.7mm. Never guess—using the wrong BC can cause discomfort or eye health issues. Your prescription is the most reliable guide. If you don't have it, request a copy from your eye doctor.
- Assess how your current lenses feel: If you already wear contacts, note any tightness, dryness, or lens movement. A lens that feels too tight (sucking sensation) may indicate you need a flatter curve (8.7mm). A lens that shifts too much or feels loose may mean you need a steeper curve (8.6mm). Comfort feedback is valuable, but always confirm with a professional before switching.
- Try a trial pair if you're between sizes: Some online stores offer single pairs or sample packs. If your prescription doesn't specify BC, or if you're trying a new brand, order one pair of each size (8.6mm and 8.7mm) to compare fit. Wear each for a few hours and note comfort, vision clarity, and lens movement. A trial pair can save you from buying a full box of lenses that don't fit well.
Lens options to consider
- WCX-579 DAHLIA WILD HONEY: The WCX-579 Dahlia Wild Honey contact lenses from EyeMuse have a base curve of 8.7mm and a water content of 38%. If your eye curvature is on the flatter side, this 8.7mm lens offers a comfortable, natural-looking option for daily wear.
WCX-579 DAHLIA WILD HONEY - WC-546 ANNE PRINCESS GREY: The WC-546 Anne Princess Grey contact lenses from EyeMuse have a base curve of 8.6mm and a water content of 38%. For steeper corneas, this 8.6mm lens provides a snug fit that stays in place while delivering a subtle grey enhancement.
WC-546 ANNE PRINCESS GREY
