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
| Cat |
VLT |
Description |
| 0 |
80 – 100% |
Fashion spectacles—not sunglasses
Very low sunglare reduction
Some UV protection
|
| 1 |
43 – 80% |
Fashion spectacles—not sunglasses
Limited sunglare reduction
Some UV protection
NOT SUITABLE FOR
DRIVING AT NIGHT
|
| 2 |
18 – 43% |
Sunglasses
Medium sunglare reduction
Good UV protection |
| 3 |
8 – 18% |
Sunglasses
High sunglare reduction
Good UV protection |
| 4 |
3 – 8% |
Sunglasses—special purpose
Very high sunglare reduction
Good UV protection
MUST NOT BE USED
WHEN DRIVING 
|
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