Improved wording?

Microscopes don't work. Stop the diagnosis of disease.

The microscope is not constructed to optimise viewing of the cell: magnification, ie, projection from the lens, would be minimised by the proximity of the lenses to the eye and the slide and their  small diameter, and viewing limited by the darkness of the cylinder and diameter of the final lens.
All  magnification leads to a loss of clarity because it stretches the object.  Relatively low magnification will also result in blurring of edges, and distortions will occur as the angle of magnification increases, with semi circles visible at 180 degrees.  Instead, what one is seeing is a complex image of an object inside the microscope, the lenses of one’s own eye and an undifferentiated image of the semi opaque stain, with low magnification achieved by the cylinder and by projection.