Why are Polarised glasses used for?
Polarised glasses are mainly used for reducing the glare.
To find out Type of Astigmatism, We first need to know the classification. There are many but the important ones are based on focal points and Principle meridians.
To understand the clinical application of Conoid of Sturm, we need to understand its basic optics.
In simple words, we can say ” Conoid of sturm is just a representation of how rays are refracted through two different powered meridians” (eg: a sphero- cylindrical lens). So, instead of one focal point, they form two focal lines.