Do microscope lenses deteriorate with age?They may do so. The surfaces of some glasses tend to become cloudy with age, particularly in the presence of moisture. The balsam used to cement lenses together may dry up irregularly, or may retract, leaving an air space. Moulds sometimes grow in the space between lenses. Many old lenses are still perfectly good, but nevertheless caution is advised when purchasing any objective more than about twenty years old.
|A long-buried bottle with 'glass disease'|
|Difficult to see but this 1950s lens has signs of|
cloudiness on the front surface