Abstract：
PURPOSE:To measure the thickness of the precorneal lipid layer and the stability of the precorneal tear film in neonates and infants in the first 6 postnatal months. DESIGN:Prospective, observational case series. PARTICIPANTS:One hundred ninety-eight neonates and infants in the newborn nursery. METHODS:The Keeler Tearscope Plus (Keeler Instruments Inc., Broomall, PA) was used to evaluate lipid layer thickness by interference fringe biomicroscopy and directly to measure noninvasive tear breakup time (NIBUT). The thickness was classified from level 1 (open meshwork-very thin) to level 9 (colored fringe pattern-very thick). MAIN OUTCOME MEASURES:Noninvasive tear breakup time in seconds and classification level of lipid layer thickness. RESULTS:The mean lipid layer classification for all newborns was 8.3 +/- 0.9, with no significant difference between genders. The thickest classifications (levels 8 and 9) were found in 83.3% of all infants. At 3 and 6 postnatal months, all infants studied had a lipid layer classification of 9. Mean NIBUT was 32.5 +/- 5.2 seconds (range, 17.6-48.5 seconds) and was not significantly different whether stratified by race, postconceptional age, or birthweight. However, although NIBUT was longer in males at birth (35.1 +/- 4.2 seconds versus 29.4 +/- 4.5 seconds; P < 0.001), it was equal in both genders at 3 and 6 postnatal months. CONCLUSIONS:In the first 6 postnatal months, the lipid layer of the tear film is much thicker than in adults. The NIBUT in newborns is prolonged compared with adult values. This thick lipid layer in infants provides stability that may help prevent the thin aqueous layer from evaporating.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Isenberg SJ,Del Signore M,Chen A,Wei J,Guillon JPdoi
10.1016/S0161-6420(03)00451-2subject
Has Abstractpub_date
2003-07-01 00:00:00pages
1408-11issue
7eissn
0161-6420issn
1549-4713pii
S0161-6420(03)00451-2journal_volume
110pub_type
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