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.
Migraine Symptoms & Signs. Medical Author: Melissa Conrad StÃ¶ppler, MD. Symptoms of a migraine come from specific physiologic changes that occur within the brain that cause the headache and associated symptoms of a migraine. Migraine headaches are often associated with sensitivity to light, sound, and smells.