Photochromatic Bausch & Lomb 58mm PhotoSun lenses are set in an early 10k gold B&L Arista frame c 1960s / early 1970s. The original Bausch & Lomb marketing materials notes that these PhotoSun lenses "were made of photochromatic glass developed by Corning Glass Works. Outdoors, they adjust automatically to the sun's brightness. In full sunlight, they allow only 20% of the light to get through. Out of the sun, they fade to a light tint - 65% transmittance. On a cloudy day, they will be somewhere in between. This action is inherent in the glass and will not wear out. PhotoSun lenses will darken to 75% of their full capacity within the first minute of exposure. Out of sunlight, they will lighten half way in 10 minutes and about 75% within 90 minutes." It's the invisible UV rays that activate this change and are filtered out to protect the eyes. B&L PhotoSun lenses are the predecessor of the later Ray-Ban Changeables line that has essentially the same optical properties. These properties are what makes these so popular with folks who don't like to take off and put on their sunglasses all the time, allowing you to have clear bright vision indoors almost like a pair of regular glasses but giving you complete anti-glare and UVA/UVBprotection in sunlight. These vintage B&L Ray-Ban shooters are 10k gold filled to give you a frame that will last many more decades, and the outdoorsman shooter ear stems give you a comfortable and secure fit even in active outdoor pursuits. These vintage PhotoSun shooters also have the General brow bar, pearlized and the thinner style which indicates an earlier production date. The top of the nose bridge is marked B&L Ray-Ban USA, while the bottom of the bridge is marked B&L 1/30 10k GO (Gold Overlay) USA, all impressed in the gold plating. The Arista 10k gold frame measures approximately 5.25" temple to temple, and the 58mm aviator style photochromatic lenses measure approximately 2.25" x 1.875" at the widest point. Rare early 10k photochromatic Changeables shooter sunglasses come direct to you from a Birmingham, Alabama estate.
Item VS299 / Price: $285.00
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