Myopia lens

The refractive index determines the thickness and weight of the lens. For mild myopia (up to -3.00), a 1.50 or 1.56 index is sufficient. For moderate myopia (-3.00 to -6.00), a 1.60 or 1.67 index is recommended to reduce edge thickness. For high myopia (above -6.00), buyers should prioritize 1.71 or 1.74 ultra-high index lenses to ensure the glasses remain lightweight and aesthetically pleasing.

Most modern lenses are made of CR-39 (resin) or Polycarbonate (impact-resistant). To enhance durability and vision, ensure the lenses include Anti-Reflective (AR) coatings, Scratch-Resistant coatings, and UV400 protection. For digital device users, Blue Light Blocking technology is a high-demand feature that adds significant market value.

Lenses must meet strict medical device regulations. For the US market, FDA registration and Drop Ball Test (ANSI Z80.1) compliance are mandatory. For the EU, CE marking and adherence to ISO 14889 standards are required. Always request Declaration of Conformity (DoC) and test reports from the supplier before finalizing a bulk purchase.

Prioritize suppliers using Digital Free-form Technology, which allows for precise customization and wider peripheral vision. For specialized needs, consider Aspheric designs, which reduce visual distortion and the 'bug-eye' effect. Ensure the Abbe Value is optimized (higher is better) to minimize chromatic aberration and ensure clear vision.

Optical products require high precision. It is critical to request golden samples for lab testing before mass production. Utilize third-party inspection services (like V-Trust or QIMA) to verify the diopter accuracy, axis precision, and coating thickness at the factory. On Made-in-China.com, look for 'Audited Suppliers' to ensure the factory has a verified quality management system.

Focus on tiered pricing based on refractive index and coatings. Negotiate for a lower MOQ on trial orders to test market response. Demand a warranty period (typically 12-24 months) against coating peeling or spontaneous cracking. For long-term partnerships, ask for OEM/ODM services including custom lens envelopes and branded microfiber cloths.

Use Secured Payment terms to protect your funds until the goods are shipped. For logistics, lenses are sensitive to pressure and temperature; ensure the supplier uses vacuum-sealed individual packaging and reinforced double-wall corrugated export cartons. Always include shipping insurance to cover potential breakage during transit.

Myopia lenses are often classified as Class I or Class II medical devices. Check the specific HS Code (typically 9001.50) for your country to determine import duties. Ensure all documentation, including the Commercial Invoice, Packing List, and Certificate of Origin, accurately reflects the medical grade of the products to avoid customs delays.