1 These thio relaxers have a gentler action than other relaxer chemicals, so are a popular option when you want effective straightening with a lower risk of damage to the hair. 2  Japanese straightening systems use thio based relaxers.ons. 1  As the name suggests, this technique relaxes hair rather then leaving it poker straight, so if you want absolute stick straight and frizz-free hair, this method may not be for you. 2  As with every chemical process, the ever present risk of damage is there.
Types of Optical Illusions. There are currently three types of optical illusions: literal illusions, cognitive illusions, and physiological illusions. Each of these illusions trick our brain into misunderstanding what we see in various ways. A cognitive illusion happens when the brain perceives an object based on prior knowledge or assumptions.
Ocular Symptoms and Conditions: Floaters, Flashing lights, Rainbows, Abnormal Color Vision, Distorted Vision. This page discusses unusual visual phenomenon such as floaters and different types of flashing lights. Other visual abnormalities such as seeing rainbows around lights, abnormal color vision, and distorted vision are discussed as well. The first grouping of abnormalities give symptoms of floaters or flashing lights. Separate sections on Rainbows, Abnormal Color Vision, Distorted Vision, and Tunnel Vision follow.