The science behind the lens
How it works
SolaraPRO uses advanced photochromic chemistry to react to UV radiation in real time, with no manual intervention.
The science behind the lens
SolaraPRO uses advanced photochromic chemistry to react to UV radiation in real time, with no manual intervention.
Experience the transition
Slide to see how SolaraPRO reacts to UV light in real time.
Indoors / Crystal clear
Night 
Cloudy 
Sun Experience SolaraPRO
Without losing clarity. Without changing your lenses.
Indoors: Crystal clear
Cloudy: Activating
Sunny: Maximum protection
Slide to activate SolaraPRO
The three states
Depending on the UV intensity present, SolaraPRO automatically adopts the state that best protects your vision.
State 1
Without UV exposure, photochromic molecules remain in their original form, without absorbing visible light. The lens is completely transparent.
Ideal for office work, reading, use in vehicles (windshields filter UV) and any indoor environment.
State 2
Under moderate UV, molecules begin to change conformation, partially absorbing visible light. The lens takes on an intermediate shade.
This happens even on cloudy days, because clouds don't fully block UV radiation — they only attenuate it.
State 3
Under intense direct sunlight, virtually all molecules activate their dark form, blocking most visible light.
The protection is equivalent to that of a quality sun lens.
The chemistry behind
Everything happens at the molecular level in fractions of a second, with no mechanical parts or user intervention.
Ultraviolet radiation from the sun reaches the lens surface. Even through clouds or partial shade, some UV radiation penetrates.
The photochromic molecules in the Spin Photo treatment absorb UV photons. This triggers a rearrangement of their chemical bonds, changing their three-dimensional structure.
The new molecular conformation absorbs wavelengths of the visible spectrum, making the material appear darker. The greater the UV intensity, the more complete the reaction.
Without UV stimulus, the reaction is thermodynamically unstable. Molecules spontaneously revert to their original state, and the lens recovers its transparency within minutes.
Protection
SolaraPRO blocks 100% of UV-A and UV-B radiation, regardless of the lens's darkening state. You don't need to wait for the lens to darken to be protected.
Cumulative UV exposure is the leading cause of cataracts, macular degeneration, and pterygium. With SolaraPRO, every time you wear your lenses, your eyes are protected.
UV on cloudy days
Up to 80% of UV rays penetrate clouds.
UV reflected by water
Water and sand multiply your UV exposure.
UV through windshield
Car glass blocks UV-B but lets UV-A pass through.
Next step
Check our FAQ or write to us directly. We're here to help you make the best decision.
Distributed and manufactured by
PR Optics is Puerto Rico's digital manufacturing optical lab. SolaraPRO is their precision photochromic lens for the local optical community.