Pre-Production Sunglasses Sample Inspection Checklist

Before approving a pre-production sunglasses sample, buyers should compare it carefully with the approved artwork, specifications, and reference sample. For the Custom Logo 2026 Fashion Retro Irregular Gradient Lens Shades UV400 Rimless Square Sunglasses for Men Women, inspection should cover branding, frame construction, lens quality, comfort, function, and packaging.

Sample Approval Priorities

• Confirm that the custom logo has the correct artwork, position, dimensions, color, clarity, and adhesion.
• Compare the rimless square frame with the approved design, checking symmetry, measurements, alignment, edges, and surface finish.
• Review the gradient lenses for color consistency, optical clarity, UV400 marking, scratches, bubbles, and distortion.
• Test the hinges, lens retention, wearing comfort, included accessories, product labels, and protective packaging.

How to Inspect the Pre-Production Sample

1. Logo and Branding Accuracy

Begin by comparing every logo application with the approved digital file or physical reference. Check spelling, spacing, size, location, color, and edge definition. The logo should be applied evenly without smearing, fading, peeling, or visible distortion. Light rubbing and normal handling should not damage the branding.

2. Frame Design and Construction

The sample should accurately reproduce the retro irregular styling and rimless square structure described in the product specification. Inspect left-to-right symmetry, lens alignment, bridge position, temple alignment, overall dimensions, and edge treatment. The rimless mounting must hold the lenses firmly, while the frame should be free from cracks, sharp edges, looseness, scratches, and unfinished areas.

3. Lens Color and Optical Quality

Evaluate both lenses under consistent lighting. The gradient should transition smoothly and match the approved color reference from pair to pair. Check transparency and optical clarity, and look for bubbles, scratches, uneven tint, spots, or visual distortion. Also confirm that the UV400 marking is present, legible, and consistent with the agreed requirements.

4. Mechanical Performance and Comfort

Open and close the temples repeatedly to assess hinge resistance and smoothness. Check whether the temples remain aligned, the lenses stay securely mounted, and the frame remains stable during use. The sunglasses should sit comfortably on the nose and ears without excessive pressure, slipping, or irritating contact points. Document each issue by position and defect type so corrections can be checked on the next sample.

5. Packaging and Product Identification

Packaging should reflect the approved product information and protect the sunglasses during handling and shipment. Verify the product name, logo presentation, quantity, labels, protective inserts, and accessories. The listed minimum order quantity is 5 pieces. No delivery schedule or export-market specification is included in the available product information.

Inspection Reference Table

Frequently Asked Questions

What logo details must be approved on the sunglasses sample?

Review the artwork, wording, size, placement, color, sharpness, adhesion, and resistance to ordinary handling. The sample should match the approved logo file or master reference in every important detail.

What is the best way to check gradient lenses?

Inspect both lenses under the same lighting and compare them with the approved color reference. Confirm a smooth gradient, clear vision, accurate UV400 marking, and the absence of scratches, bubbles, stains, or distortion.

Which functional tests should be completed before approval?

Test repeated hinge movement, temple alignment, lens security, rimless mounting strength, frame symmetry, and comfort during wear. Any looseness, instability, cracking, or sharp edge should be recorded for correction.

Approval Recommendation

Release the sample for bulk production only when its logo, retro rimless square frame, gradient lenses, UV400 marking, optical performance, hinges, comfort, packaging, and identification details meet the agreed standard. Yiwu Green Shine Arts & Crafts Co., Ltd. provides OEM and ODM eyewear manufacturing, with a stated annual capacity of more than 3 million pairs of sunglasses. For technical assistance or project support, contact leoxiao@cngreenshine.com.

About the Manufacturer

Yiwu Green Shine Arts & Crafts Co., Ltd. was founded in 2016 in Yiwu, Zhejiang Province. The company specializes in fashion eyewear such as sunglasses, optical frames, acetate sunglasses, children's sunglasses, and reading glasses. It has 10 employees and operates in a 130 square meter factory. Its product development services include 3D modeling, rapid prototyping, structural improvement, sample trial production, mold customization, and OEM and ODM design support.