What's new AAPOS 2008 - The Private Eye Clinic

RESULTS: Directly after birth, corneal diameter was 9.98 mm, increasing to a plateau of
11.51 mm within the first 24 months of life. The coefficient of variation was 1.3%. Each
measurement took no more than a few minutes.
CONCLUSIONS: This method allows very precise, fast, noncontact measurements of
corneal diameter in newborn and young children.
Bacterial keratitis after primary pediatric penetrating keratoplasty.
Wagoner MD, Al-Ghamdi AH, Al-Rajhi AA.
Am J Ophthalmol. 2007 Jun;143(6):1045-7.
PURPOSE: To determine the prevalence, microbiological profile, and prognosis for
bacterial keratitis after primary pediatric penetrating keratoplasty (PKP).
METHODS: Retrospective review of all cases of primary PKP performed in children 12
years of age or younger at the King Khaled Eye Specialist Hospital between January 1,
1990 and December 31, 2005 and inclusion of all postoperative cases of culturepositive,
bacterial keratitis.
RESULTS: Culture-positive bacterial keratitis developed in 35 (17.3%) of 202 primary
keratoplasties. Gram-positive organisms were cultured in 91.4% of infected eyes and
accounted for 77.6% of isolates. Streptococcus pneumoniae was the most common
organism. No eyes achieved a final visual acuity of 20/40 or better, while 65.7% had
hand motions or worse.
CONCLUSIONS: Bacterial keratitis after pediatric keratoplasty is a serious complication
that is associated with a high risk of graft failure and poor visual outcome.
Effect of Central Corneal Thickness and Radius of the Corneal Curvature on
Intraocular Pressure Measured with the Tono-Pen and Noncontact Tonometer in
Healthy Schoolchildren.
JPOS 2007; 44:216-222.
Central corneal thickness measurement has become increasingly important in the
diagnosis and management of glaucoma. Most published studies of the effect of
corneal thickness on IOP measurement have been based on the Goldman tonometer.
The Tonopen and noncontact tonometer are currently in widespread clinical use,
especially in pediatrics. IOP was measured in 602 eyes in 602 healthy Turkish
schoolchildren. The Tonopen measured IOP values slightly higher than the noncontact
tonometer. The IOP increased 2.1 and 4.2 mmHg with every 100-um increase in
central corneal thickness for the Tono-Pen and the noncontact tonometer, respectively.
The noncontact tonometer tended to overestimate IOP in eyes with thicker corneas.
The corneal radius of curvature had no effect on measured IOP with either device. The
Tonopen is easy to use and less affected by corneal thickness and may be an
alternative method for measuring IOP in children.
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