The titanium alloy used in the frames also prevents allergic reactions. Silhouette's Titan Minimal Art frames possess a super elasticity that ensures a slip-free fit for wearing comfort, without causing irritating pressure points. Long durations in spacesuits preclude astronauts from using their hands in the event that their eyeglasses slip out of place. The already difficult-to-handle conditions of space are further exacerbated by the fact that astronauts can be on the job for up to 10 hours without pause, while wearing tight-fitting helmets. A loose screw or component during an EVA could be nasally or orally ingested, causing choking could be drawn into the coolant system impeller, causing mechanical suit failure or could cause a tear in the suit bladder, resulting in a loss of suit pressure. Such hazards could potentially come in to play during Extra Vehicular Activity (EVA), when astronauts spacewalk with only the protection of their spacesuits.
Because astronauts work in sensitive environments, tiny screws or eyeglass components that become loose or fall off could lead to a catastrophe. The frame, produced by Silhouette International Schmied AG (Silhouette), is extremely light in weight and devoid of hinge screws, which reduces the danger potential for astronauts to a minimum. After rigorous testing by NASA scientists, the Agency agreed that the Titan Minimal Art frame was best suited to protect the eyes of astronauts on their space missions. He and a company renowned for its stylish eyewear products are responsible for bringing a titanium alloy frame to NASA that can withstand the extreme conditions of space travel. Manuel's contribution to the Space Program does not stop there, however. Ever since this initial research effort, he has continued to provide vision care for the astronaut corps, while finding time to co-author the ophthalmic chapter in the book, "Principles of Clinical Medicine for Space Flight."ĭr. Manuel was selected by NASA's Johnson Space Center to perform studies establishing the viability of contact lenses in space flight. Keith Manuel has been recognized as the "official" optometrist overseeing the NASA Space Shuttle, the International Space Station, and various other vision-related space projects.
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