Ray-Ban 10k GF PhotoSun Changeables Sunglasses
Vintage Ray-Ban 10k GF PhotoSun Changeables were the first true Bausch & Lomb photochromatic lens and here is set in their early 10 gold filled frame c 1960s / early 1970s. The original Bausch & Lomb marketing materials note that these PhotoSun lenses "were made of photochromatic glass from a formula 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. Bausch & Lomb 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/UVB protection in sunlight. The Outdoorsman "shooter" ear stems give you a comfortable and secure fit even in active outdoor pursuits, and the "General" brow bar, is an early version and improves the balance of the sunglasses on the face. The top of the nose bridge is impressed B&L Ray-Ban USA, while the bottom of the bridge is impressed B&L 1/30 10k GO (Gold Overlay) USA. The unisex Ray-Ban 10k GF Outdoorsman frame measures approximately 5.25" temple to temple, and the 58mm PhotoSun lenses measure approximately 2.25" x 1.875" at the widest points, direct to you from a Birmingham, Alabama estate. Rare.
Item VS299 / Price: $425.00
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