Check sunglasses for UV protection and driving
Match UV and driving claims to the exact model and lens variant, then arrange professional checks of production samples. Lens darkness, polarisation and stickers cannot establish suitability. Ask for measured results and written driving restrictions. Coordinate factory samples through Cambridge China Bridge.
Match the evidence to the actual lenses
Request the complete test report, sample photographs and lens specification for the model you intend to buy. Match the frame reference, lens material, tint, coating and manufacturer to your order. A report for a similar-looking frame does not establish the performance of different lenses. Use our test report verification guide to check the document and issuing laboratory.
Ask the laboratory which variants its results cover and why. Treat changes in tint, mirror coating, lens material or lens supplier as reasons to review that coverage before accepting the evidence. Our guide to reports covering colours and sizes explains how to resolve variant coverage.
Replace stickers and visual guesses with measurements
Do not approve UV protection because lenses look dark, carry a protection sticker or are described as polarised. Treat each advertised claim as something to substantiate for the supplied lenses. Ask an optical laboratory to measure ultraviolet transmission across the relevant wavelength range and assess whether the results support the wording you intend to use.
A torch, reactive card or screen demonstration is not an adequate purchase acceptance test. Ask the professional what the instrument measures, which wavelengths it covers and what it cannot establish. Keep measured results, sample identity and the interpretation together rather than accepting an unexplained pass message.
Arrange professional checks with a clear scope
For an individual pair, ask an optician whether they have suitable equipment to check UV transmission and optical quality. Confirm the scope before visiting. A shop screening check may answer a limited question about that pair; do not use it as evidence that an entire commercial batch meets all relevant requirements.
For stock intended for sale, commission a laboratory with relevant sunglasses testing capability. Ask it to identify the applicable standard and edition, assess UV and visible-light transmission, and check optical power, prism imbalance and lens quality. Have production samples selected and identified independently. Our sample chain of custody guide covers their route to the laboratory.
Assess driving suitability separately
Ask the laboratory to report the measured filter category and assess driving suitability, including visible-light transmission and traffic-signal recognition. Request a written conclusion stating any restrictions on road use, daytime use, twilight or night use. UV protection alone does not establish driving suitability. The Highway Code advises against tinted glasses, lenses or visors at night or in poor visibility if they restrict vision.
For polarised lenses, check instrument and navigation-screen readability while the vehicle is stationary. For light-sensitive lenses, ask how performance changes behind a windscreen and as lighting changes. Ask an optician to assess fit, peripheral visibility and any prescription needs. These practical checks supplement laboratory evidence; they do not replace it.
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Make batch release depend on the evidence
Put the approved lens specification, supported claims, driving restrictions and sample references into the order. Require written approval before changing lens materials, coatings or suppliers. Compare production goods and packaging with the tested specification, and ask the laboratory whether changes require further testing. For clearance purchases, use our stock-lot buying guide for provenance and reservation checks.
Hold goods with mismatched reports, unexplained lens substitutions or unresolved results outside saleable stock. Agree corrective work and rechecking before release. Cambridge China Bridge’s staff in China can coordinate sample collection and factory follow-up; the appointed optical professional should provide the measurement findings and technical interpretation.
Frequently asked questions
Are darker sunglasses better for UV protection?
Darkness does not establish UV protection. Ask for measured UV transmission results matching the exact lens material, tint and coating supplied.
Can an optician test sunglasses bought from China?
Ask whether the optician has suitable equipment and what the check covers. For commercial stock, arrange laboratory testing with identified production samples and a written scope.
Are polarised sunglasses suitable for driving?
Polarisation alone does not establish suitability. Obtain a driving assessment covering light transmission and signal recognition, then check dashboard and navigation-screen readability while stationary.
Does a supplier’s UV sticker prove protection?
Treat the sticker as a claim to verify. Match it to the exact-model report and measured results, and resolve any difference between the tested lenses and supplied stock.