Br J Ophthalmol 1998;82:643-649 ( June )
Measurement of optic disc size: equivalence of methods to correct
for ocular magnification
D F Garway-Heath,a
A R Rudnicka,b
T Lowe,c
P J Foster,d
F W Fitzke,c
R A Hitchingsa
a Glaucoma Unit, Moorfields Eye
Hospital, London, b Applied Vision Research Centre, City University, London, c Institute of Ophthalmology, London, d Singapore
National Eye Centre, Republic of Singapore
Correspondence to: D F Garway-Heath, Glaucoma Unit,
Moorfields Eye Hospital, City Road, London EC1V 2PD.
Accepted for publication 9 January 1998
AIMS To compare methods available to correct the
magnification of images that result from the optics of the eye and
identify errors, and source of error, of the methods.
METHODS11 methods were applied to ocular biometry
data from three independent cohorts. Each method was compared with the
method of Bennett, which uses most biometric data. The difference
between each method and Bennett's is the "error" of the method.
The relation between the error and axial length, ametropia, and
keratometry was explored by linear regression analysis.
RESULTSMethods using axial length had the lowest
mean (+0.5 to +2.6%) and standard deviation (0.6 to 1.2%) of errors.
Of methods using keratometry and ametropia only, the lowest mean
( 1.4% to +4.4%) and standard deviation (2.9 to 4.3%) of errors
was found for a new method described in this paper, and that used by
the Heidelberg retina tomograph (HRT). The highest mean error (+2.2 to
+7.1%) was found for Littmann's method. Littmann's correction was
larger than the HRT's by 3.5 to 3.7%. The mean difference between the
new and HRT methods and the "abbreviated axial length" method of
Bennett is 1.3 to +2.0%. The error of the "keratometry and
ametropia" methods is related to axial length.
CONCLUSIONSMethods using axial length are most
accurate. The abbreviated axial length method of Bennett differs little
from more detailed calculations and is appreciably more accurate than
methods using keratometry and ametropia alone. If axial length is
unknown, the new and the HRT methods give results closest to the
abbreviated axial length method.
Keywords:
Littmann;
magnification;
optic disc;
imaging
© 1998 by British Journal of Ophthalmology
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