I don't know about the tints used on goggles but what you may be seeing is a coating on the canopy reflecting on the visor.
When aircraft canopies are manufactured various coatings are applied depending on the requirements of the end user, these can be anti-scratch or various other functionc. Many US manufactured aircraft have a thin gold based coating applied to the canopy which is radar reflective. The smooth canopy surface then becomes the refelctive surface and scatters radar signals far and wide rather than them passing through the normally radio lucent canopy and reflecting off the flat surfaces of the cocpit interior. hence, all part of the stealth improvements to non stealth aircraft by reducing radar cross section.