There are several advantages to using tempered glass and it should be the only glass used in safety applications and applications that require a lot of temperature changes (such as freezing and heating). Tempered glass is 4-5 times stronger than regular glass.
A visual migraine is a temporary visual distortion that often begins with a small sparkling, shimmering area that slowly expands outward. The growing spot often has jagged, zig-zag edges. The visual symptoms typically last approximately 20-30 minutes and then completely resolve.
Photophobia, increased sensitivity to light, is one of the most common of Migraine symptoms. It can begin during the Migraine prodrome and continue throughout the Migraine attack. Many Migraineurs are, in fact, photophobic even between Migraines, and light can increase the pain of a Migraine.