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.
Migraines Stress also causes migraines, and migraines can cause both eye pain and vision problems. Not all migraines cause headaches either. Some people may experience silent migraines which can cause many of the same symptoms of migraines but without the associated headache.