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(Investigative Ophthalmology and Visual Science. 2006;47:4683-4686.)
© 2006 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.06-0152
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Optic Disk Size and Optic Disk-to-Fovea Distance in Preterm and Full-Term Infants

Don Julian De Silva,1,2 Ken D. Cocker,3 Gordon Lau,4 Simon T. Clay,5 Alistair R. Fielder,1,3 and Merrick J. Moseley3

1From the Department of Ophthalmology, Western Eye Hospital, London, United Kingdom; the 2Department of Ophthalmology, Moorfields Eye Hospital, London, United Kingdom; the 3Department of Optometry and Visual Science, City University, London, United Kingdom; and the 4Department of Visual Neuroscience and the 5Photonics Group, Department of Physics, Imperial College London, United Kingdom.

PURPOSE. Few studies have assessed optic disk and retinal morphology in infants. Here the optic disk and optic disk-to-fovea distance were measured in preterm and full-term infants in vivo.

METHODS. Optic disk (OD) dimensions and the center-to-center distance between the OD and the macula were measured using digital imaging in infants undergoing routine ophthalmic examinations. Postmenstrual age of the mother at the time of examination ranged from 32 to 50 weeks. From each image, the OD-to-fovea distance (ODF) and the OD height (ODH) and OD width (ODW) were measured.

RESULTS. In 51 retinal images from 51 infants, mean ± SD values obtained were 4.4 ± 0.4 mm (ODF), 1.41 ± 0.1 9 mm (ODH), and 1.05 ± 0.13 mm (ODW). These dimensions did not change significantly over the age range studied. The mean value for the ratio between ODF and mean OD diameter (ODF/DD) was 3.76.

CONCLUSIONS. Results of this in vivo study suggest that though the optic nerve head diameter increases by more than 50%, only limited growth occurs at the highly organized area of the posterior pole from birth to adulthood. This study discusses the finding of a large-angle kappa in infants and the use of a disk macula/disk diameter ratio in the diagnosis of optic nerve hypoplasia.




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F. Ghasia, J. Brunstrom, M. Gordon, and L. Tychsen
Frequency and Severity of Visual Sensory and Motor Deficits in Children with Cerebral Palsy: Gross Motor Function Classification Scale
Invest. Ophthalmol. Vis. Sci., February 1, 2008; 49(2): 572 - 580.
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