PKP
penetrating keratoplasty
PMD
pellucid marginal degeneration
PNS
Pentacam® nucleus staging
PRK
photorefractive keratectomy
PTK
phototherapeutic keratectomy
QS
Quality Specification
R
radius
RGPCL rigid gas permeable contact lens
RK
radial keratotomy
RNFL
retinal nerve fiber layer
RP
relative pachymetry
SA
spherical aberration
SD
standard deviation
sph
sphere
TCA
total corneal astigmatism
TCRP
Total Cornea Refraktive Power
TP
thinnest point
UCVA
uncorrected visual acuity
WTRA
with the rule astigmatism
μm
micron
30 List of abbreviations
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