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.
These headaches are intense or severe and often have accompanying symptoms in addition to head pain. Symptoms associated with a migraine headache include: 1  nausea. 2  pain behind one eye or ear.3  pain in the temples. 4  seeing spots or flashing lights. 5  sensitivity to light and/or sound. 6  temporary vision loss.hese headaches are intense or severe and often have accompanying symptoms in addition to head pain. Symptoms associated with a migraine headache include: 1  nausea. 2  pain behind one eye or ear.