An argon-fluoride laser that emits ultraviolet light that is emitted in pulses at a wavelength of 193 nm. The term Excimer comes from the concept of an energized molecule with two ...
With the rule astigmatism has an axis of about 180 degrees (when Rx is written in minus cylinder form). "Against the rule" astigmatism has the axis at about 90 degrees.
Both forms ...