Br J Ophthalmol 2000;84:138-143
( February )
Long term refractive outcome in eyes of preterm
infants with and without retinopathy of prematurity:
comparison of keratometric value, axial length, anterior
chamber depth, and lens thickness
Mi Young Choia, In Ki Parkb, Young Suk Yub
a Department of
Ophthalmology, College of Medicine, Chungbuk National University,
Cheongju, Korea, b Department of
Ophthalmology, College of Medicine, Seoul National University, Seoul,
Korea
Correspondence to: Young Suk Yu, MD, Department of Ophthalmology, College of Medicine,
Seoul National University, 28 Yongon-dong, Chongro-gu, Seoul 110-744, Korea
Accepted for publication 15 September 1999
BACKGROUND/AIMS A
longitudinal study of premature infants was conducted to examine
changes in refractive status and their relation with age and factors
influencing the occurrence and degree of myopia. Identification of
which of the various refractive factors play important parts in
relation to myopia in premature infants was attempted.
METHODSUnder
observation were 125 eyes in 65 patients who were found to demonstrate
no signs of retinopathy of prematurity (ROP) or who had grade I or II
ROP without or after cryotherapy. Cycloplegic refractions were
conducted at 6 months, 3 years, and 6 years of age; at 6 years of age
keratometric values, lens thicknesses, and axial lengths were recorded,
and anterior chamber depths also were measured.
RESULTSMyopia begins
to appear at 6 months of age and its severity increases between the
ages of 6 months and 3 years. The condition showed no further progress
in subjects older than 3 years. Of the 104 eyes with ROP, those eyes
with cicatricial retinopathy tended towards myopia and high myopia
while there was no difference in the degree of myopia related to
whether or not cryotherapy was conducted. At 6 years of age, the
premature infants exhibited shallower anterior chambers, thicker
lenses, and higher axial lengths when the degree of the myopia was
higher. The keratometric values, however, appeared to bear no relation
to the degree of the myopia.
CONCLUSIONThese
results suggest that the occurrence of myopia is related more strongly
to whether or not there is cicatricial retinopathy than whether or not
there is cryotherapy. Also, the degree of the myopia was found to be
related to the depth of the anterior chamber, the thickness of the
lens, and the change in axial length but not to keratometric value.
© 2000 by British Journal of Ophthalmology
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