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While all Ryders lenses are 100% UV the VLT or visible light transmittance can vary.
(VLT) Visible Light transmittance is the amount of light that reaches your eyes through the lenses and is measured as a percentage as shown on some Ryders styles.
Photochromic lenses have a range in transmittance as they will darken in the sun i.e. VLT: 77%-17%.
Below is a guide for choosing sunglasses based on VLT percentages.
0–19% VLT: Ideal for bright, sunny conditions.
20–40% VLT: Good for all-purpose use & varying light conditions.
40+% VLT: Best for overcast and low-light conditions.
80–90+% VLT: Virtually clear lenses for very dim and low light conditions.