L c 298x108196x10 12 588x104m 059mm coh coh t. If the centre of the range of wavelengths emitted is l and the range of wavelengths emitted is Dl this coherence length equals l 2 2Dl. Optical coherence biometry has revolutionized cataract surgery.
L c n D f l 2 n D l displaystyle L c over nDelta f lambda 2 over nDelta lambda where.
Optical coherence biometry has revolutionized cataract surgery. Coherence small hence hard to create holograms. Cutting-edge multivariable IOL calculation formulae such as the Olsen Barrett or Holladay 2 formula for sophisticated IOL calculation demand more than just the axial length and keratometry measurement. This means that its relative frequency stability is approx 3 10 4 and if its frequency is 12 GHz then its linewidth will be 3 MHz and coherence length 90 metres.