What describes the function of Corning's Sunsensors in lens technology?

Corning's Sunsensors are advanced materials designed to enhance lens technology through the use of photochromic crystals. These crystals have the ability to respond to ultraviolet (UV) light, causing the lenses to change color when exposed to sunlight. This process is essential for reducing glare and providing comfort for the eyes in bright conditions.

The first choice accurately captures the idea that these systems employ a type of technology that involves photochromic materials, which are crucial for making lenses that adapt to varying lighting conditions. By implementing this mass technology, the Sunsensors effectively improve the overall experience for users who require eye protection and visual acuity under different ambient light situations.

In contrast, the other options describe features or characteristics that do not align with the functionality of Corning's Sunsensors. For example, the idea that lenses change color in darkness, or that photochromic molecules are only on the surface, doesn't reflect the true functional design and capabilities of these advanced lenses. Additionally, while providing UV protection is a benefit of many lenses, the statement about offering protection without any color change does not pertain to the primary innovation that Sunsensors offer, which focuses on dynamic adaptation to light exposure.