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D. De Silva, K.D. Cocker, S.T. Clay, A.R. Fielder; Measurement of the Optic Disc and Optic Disc-Macula Distance in Preterm and Term Infants . Invest. Ophthalmol. Vis. Sci. 2003;44(13):1660.
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Purpose: To obtain, from term and preterm infants, measurements of the centre-to-centre distance between the optic disc (OD) and macula and of the height and width of the OD. These measurements will be compared with published measurements from adult eyes. Methods: We collected 65 fundus images of left and right eyes from 43 babies undergoing routine examinations at St Mary’s Hospital London using the Retcam 120 digital fundus camera (Massie Labs, Dublin, CA). Babies’ corrected ages at the time of examination ranged from 46 days pre-term to 62 days post-term. From each image we measured the OD-Fovea distance (ODF) and the OD height (ODH) and width (ODW). Results: The mean+/-SD values obtained were: ODF = 4.2+/-0.4mm, ODH = 1.29+/-0.15mm and ODW = 0.98 +/-0.15. These dimensions do not change significantly over the age range studied. The mean value for the ratio between ODF and mean OD diameter (ODF:DD) was 3.75+/-0.52mm. Conclusions: The mean ODF, ODH and ODW for adult subjects have been reported as 4.9+/-0.3 mm, 1.90+/-0.22mm and 1.78+/-0.21 respectively (Williams & Wilkinson, Optom. Vis. Sci. 1992; 69(5): 369-377). The overall globe diameter increases from 15 to 23.4mm from infancy to adulthood and our results demonstrate an average proportionate increase in OD diameter of the order of 60%. The ODF values however differ by a mere 10% suggesting that there is relatively little change in the spatial arrangement of the posterior pole. This is in agreement with the hypothesis that the majority of growth in the globe occurs around or anterior to the equator and that growth in the highly organized and visually critical region of the central retina is kept to a minimum.
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