The earliest simple microscope from its key word simple meaning, easy to use, not complicated. Since it had only one lens and is called Simple microscope. Unlike compound microscope that contain two or more lenses. Simple microscopes are magnifying glasses or its other term, hand glass. It was the first simple microscope used by Anton van Leeuwenhoek that he discovered earliest simple microscopic lens. The lens produce magnified images of small or minute objects that cannot be seen by the naked eye. They have one glass lens that focuses light. The magnifier or hand lens in a simple microscope is usually a round piece of transparent material and has ground thinner at the edge than at the center which can form an enlarge image of a tiny object. The image is received by direct imaging and electronic processing or a combination of both methods.

The most popular type of microscope of this kind is the optical or light microscope where in its lenses are used to form the image. Simple microscope commonly is double convex or Plano convex lenses or system acting together to form the image. Examples of instruments of this type are the reading lens and the hand lens. People who commonly used these simple microscopes are doctors and scientists allowing them to view objects at a scale convenient for examination and analysis. This simple microscope as used then by doctors and scientists find it very essential and helpful in their jobs. They find it very helpful after the earliest simple microscope was discovered by the father of microbiology, Anton van Leeuwenhoek. Simple microscope nowadays, are still being used by students with their projects and used them for study be it in the laboratory or may use this outdoors using a simple hand lens for doing their assignments and studies