When customers shop for colored contact lenses, the material is one of the most important factors affecting comfort, eye health, and wearing experience. But with so many material options available, it can be confusing to understand which is best.
Here is a practical guide to the three main contact lens materials — HEMA, silicone hydrogel, and PMMA — and what they mean for your brand.
HEMA Hydrogel: The Industry Standard
HEMA (hydroxyethyl methacrylate) has been the dominant contact lens material for decades. It is water-based, soft, and comfortable for everyday wear. Most colored contact lenses on the market today use HEMA hydrogel.
Key characteristics:
- Water content: typically 38-55%
- Oxygen permeability (Dk/t): approximately 25-30
- Soft, flexible, easy to handle
- Cost-effective — good for daily wear and short-term use
Comfort profile: HEMA lenses feel soft and comfortable initially. The high water content keeps lenses moist and flexible. However, in dry environments (air-conditioned offices, airplane cabins), HEMA lenses can dry out, causing discomfort after 6-8 hours of wear.
Best for: Daily wear customers who wear lenses for 6-8 hours, budget-conscious brands, and fashion-focused brands that prioritize color variety and affordability.
Silicone Hydrogel: The Premium Option
Silicone hydrogel is the newer generation of contact lens material. By adding silicone to the hydrogel matrix, oxygen permeability increases dramatically — often 5-6 times higher than traditional HEMA.
Key characteristics:
- Oxygen permeability (Dk/t): 100-175 (varies by brand)
- Water content: typically 24-45% (lower than HEMA)
- Better for extended wear — some approved for overnight use
- Higher production cost, positioned as premium
Comfort profile: Silicone hydrogel lenses maintain oxygen flow even as surface moisture decreases. This means they stay comfortable longer in dry environments. However, the silicone component makes lenses slightly stiffer than HEMA, which some first-time wearers notice.
Best for: Health-conscious consumers, extended wear users, premium brands that want to differentiate on quality, and customers who wear lenses for 10+ hours daily.
PMMA: The Historical Material
PMMA (polymethyl methacrylate) was the first material used for rigid contact lenses. It is completely non-porous and does not allow oxygen to pass through to the cornea.
Key characteristics:
- Oxygen permeability: essentially zero
- Rigid, non-flexible
- Not used in modern soft colored contact lenses
Why it matters: PMMA is essentially obsolete for soft contact lenses. The eye needs oxygen to stay healthy, and PMMA lenses cause significant oxygen deprivation. You will not encounter PMMA in modern colored contact lens manufacturing, but it is worth understanding for historical context.
Side-by-Side Comparison
Oxygen permeability:
- HEMA: ~25-30 Dk/t
- Silicone hydrogel: ~100-175 Dk/t
- PMMA: ~0 Dk/t
Comfort for extended wear:
- HEMA: Good for 6-8 hours
- Silicone hydrogel: Excellent for 10+ hours
- PMMA: Not suitable for soft lens wear
Cost:
- HEMA: Lowest
- Silicone hydrogel: 30-50% higher than HEMA
- PMMA: Not applicable
Manufacturing complexity:
- HEMA: Well-established, high yield rates
- Silicone hydrogel: More complex, requires specialized equipment
- PMMA: Obsolete
What This Means for Your Brand
If you are building a colored contact lens brand, your material choice shapes your entire brand positioning:
HEMA hydrogel brand: Focus on fashion, color variety, affordability, and daily wear convenience. Target customers who change lenses for different looks and replace them frequently.
Silicone hydrogel brand: Focus on eye health, extended comfort, premium quality, and science-backed benefits. Target customers who wear lenses all day and prioritize eye health.
Hybrid approach: Offer both. Many successful brands carry a HEMA line for fashion-focused, budget-conscious customers and a silicone hydrogel line for premium, health-conscious buyers.
The Bottom Line
HEMA hydrogel remains the most popular material for colored lenses due to its comfort, color versatility, and accessibility. Silicone hydrogel is the premium choice for customers who prioritize oxygen permeability and extended wear. PMMA is obsolete and not used in modern soft colored contact lenses.
At MIOMI, we manufacture in both HEMA and silicone hydrogel, giving our partners the flexibility to serve diverse market segments. Our manufacturing capabilities include cast molding for both materials, with rigorous quality control at every stage.
