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.
There are two types of migraines that are referred to as ocular migraines. Some people refer to migraines with auras as ocular migraines. Some people experience an aura approximately 10 to 30 minutes before a migraine sets in. Aura symptoms can include: numbness or tingling in the hands or face.