What is Dry Eye?

  Dry eye is an uncomfortable and potentially harmful condition in which the eye fails to produce enough tears. This vital substance does much more than just lubricate the eyes. Tears also safely wash away foreign bodies and contain

What Are Convex Lenses?

Convex lenses are constructed from transparent material and attached to two different surfaces. One of these surfaces must be curved. When these spherical surfaces bulge outwards, it is called a convex or bi-convex lenses. A piece of glass