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.

LENS CATEGORIES AND DESCRIPTIONS