2.4K views · 23 reactions | A Spherical Parallel Manipulator can achieve precise three-dimensional movements with high accuracy. [ MakeBreakRepair] | Meme for mathematicians | Facebook

Astigmatism is a common kind of refractive error that can cause blurred vision and headaches. It occurs when the front surface of the eye is not spherical, or not completely round. Symptoms are: •Blurred vision •Tired or dry eyes •Headaches - especially while trying to focus and struggling while focusing to read. In most cases, astigmatism can be corrected by wearing fitted glasses or lenses and in some cases, it can also be corrected by laser surgery. اللابؤرية أو الاستجماتيزم هي نوع شائع من عي