When applying lens sample to measure the surface area to view the resolution (by instrumentation OM) in which the value of the resolution of the surface area of the sample, there are clearly differences in lens.
When applied to the sample lens surface area to check the resolution (without instrumentation. OM) is the definition of the surface area of the sample lens is a clear distinction.
The sample lens to surface area to check the resolution (by a measuring instrument OM) which the value of the resolution of the surface area of the sample lens is different obviously.