Joseph Lister
The microscope’s next advancement occurred in 1830 by Joseph Lister of Britain. He invented an achromatic lense for the microscope. This lense system consists of two individual lenses made with different glass, therefore offering different amounts of light dispersion. This improved the overall microscope’s performance, and it also reduced the spherical defects, or chromatic effect, when looking at a specimen. Lister had shown that several weak lenses fused together at certain distances, made a better magnification system, than just a stronger single lense. This was a big leap in microscope design, and is what our modern microscopes are based on.