In the eyewear industry, choosing the right lenses is crucial for vision health and visual experience. Here are 10 common questions about lens selection&functions to help you make the right decisions.
Q1: Is Higher Lens Refractive Index Better?
Nop.Many people think a higher refractive index means better lenses. But that's not correct. A higher index makes lenses thinner, but it may lower the Abbe number (affecting imaging quality).Choose the suitable lens based on your prescription:
*Low prescription: suggest 1.56, 1.60
*Medium-high prescription: suggest 1.67
*Ultra-high prescription: suggest 1.74
Q2: Benefits of Coated Lenses
Coated lenses offer multiple advantages: like anti-reflection, anti-static, easy cleaning, and wear resistance.
High-quality coated lenses have a natural, light reflective film.
Q3: Effectiveness of Blue Light Blocking Lenses
Blue light blocking lenses can block harmful blue light, perfect for using digital products for long time. They may have slight color distortion, so adapt initially. Stick for branded lenses for reliability.
Q4: Can Crystal Lenses Protect Eyes?
No. Crystal lenses are low-quality. They cause ghosting and can't block infrared/ultraviolet rays, so they don't protect eyes.
Q5: What Influences Photochromic Lens Darkness?
Photochromic lenses change color based on UV intensity. They're darker in strong sunlight and lighter in soft light or inside cars (due to UV blockage by windows).
Q6: Glaucoma and Photochromic Lenses
People with glaucoma shouldn't work or read in the dark for long, so photochromic lenses aren't suitable.
Q7: Aspherical Lenses – Definition & Advantages
Aspherical lenses have less edge aberration, more realistic vision, and are thinner/flatter. Perfect for those with higher prescriptions.
Q8: Bifocal vs. Progressive Multifocal Glasses
Bifocal glasses have two distinct zones (distance/near, no transition). Progressive lenses offer continuous clear vision from far to near, are more aesthetic, but need adaptation.
Q9: How Often to Replace Lenses
Regular lens replacement is recommended- Every 1.5-2 years under normal use. If there's severe scratching, film peeling, prescription change, or yellowing, please replace immediately.
Q10: Judging Lens Quality
Good lenses have soft reflection, high light transmittance, and clear vision. Check whether it has smooth surfaces, no bubbles or impurities, and ensure authenticity via brand authorization.
