lens 90d

When evaluating a 90D (Diopter) lens, which is the gold standard for general fundus examination, you must prioritize optical clarity and coating quality. Ensure the lens is made of high-transmission glass to provide a high-resolution retinal image. The static field of view should typically be around 74° to 89°, with a magnification factor of approximately 0.76x. Additionally, verify that the lens features a high-quality anti-reflective (AR) coating to minimize glare and reflections during slit lamp examinations.

As a medical device used in ophthalmology, the 90D lens must adhere to strict international standards. You should require suppliers to provide ISO 13485 certification for medical device quality management systems. Depending on your target market, the product must have CE Marking (EU) or FDA Registration (USA). Compliance with ISO 15004-2 (Ophthalmic instruments - Fundamental requirements and test methods) is also essential to ensure light safety and optical performance.

Durability is determined by the scratch resistance of the coating and the housing material (usually anodized aluminum). Ask the supplier for the cleaning and sterilization protocol; high-quality lenses should be compatible with common disinfectants like 70% isopropyl alcohol or specific cold sterilization solutions. For high-volume clinical environments, check if the supplier offers autoclavable versions, though standard 90D lenses are typically non-autoclavable.

The 90D lens is primarily used for non-contact fundus examination via a slit lamp. It is ideal for small pupil examination and provides a balanced view of the posterior pole. It is a staple tool for glaucoma screenings, macular degeneration assessments, and general retinal health checks. Its small diameter makes it highly portable and easy to manipulate during examinations.

To ensure authenticity, source exclusively from verified manufacturers on Made-in-China.com who possess audited factory reports. Request real-time video inspections of the lens under a lensometer to verify the actual diopter power and surface smoothness. Always order a sample first to check for chromatic aberration or edge distortion before committing to a bulk purchase.

Focus your negotiation on Quality Assurance (QA) terms rather than just the unit price. Request a warranty period of at least 12 to 24 months. For bulk orders, negotiate for customized laser engraving of your brand logo on the lens ring and protective leather carrying cases to be included in the package at no extra cost.

Optical lenses are fragile and sensitive to temperature/pressure. Ensure the supplier uses shock-absorbent foam packaging and double-walled corrugated boxes. For customs, ensure the HS Code (typically 9018.50) is correctly declared. Be aware that many countries require the importer to have a Medical Device Import License; confirm your local eligibility before the goods reach the border.

Utilize secured payment services provided by Made-in-China.com to ensure funds are only released upon confirmation of shipment. For large-scale procurement, consider hiring a third-party inspection agency (like SGS or Intertek) to perform a pre-shipment inspection to verify that the batch meets the agreed-upon optical standards.