Instruments
The PHOROPTER
The PHOROPTER or Refractor First phoropter was introduced in 1917 by Nathan Shigon. Phoropter is a common n…
The PHOROPTER or Refractor First phoropter was introduced in 1917 by Nathan Shigon. Phoropter is a common n…
Newton’s rings The series of concentric light and dark colored bands, between two pieces of glass. One glas…
TONOMETER · One of the oldest, this device is used to measure the pressure of the fluids inside t…