Postnatal development of canine axial globe length measured by B-scan ultrasonography.
OBJECTIVE
The objectives of this study were to document the development of axial globe length (AGL) in normal mesocephalic cross-bred dogs between 2 and 52 weeks of age, to determine a relationship between AGL and age, and derive an equation to predict AGL in normal mesocephalic cross-bred dogs. ANIMALS STUDIED AND PROCEDURE: The AGL of twenty normal mesocephalic cross-bred dogs was measured at 12 time points from 2 to 52 weeks of age using B-scan ultrasonography.


RESULTS
The mean (+/- SEM) AGL increased from 12.65 mm (+/- 0.18) at 2 weeks of age to 19.52 mm (+/- 0.18) at 52 weeks of age. The correlation between AGL and age was evaluated by fitting possible variables to a regression pattern. A linear model of natural logarithmic-transformed value of AGL (mm) and age (week) was established. Side (left or right eye) and gender did not correlate with development of AGL.


CONCLUSIONS
A reverse transformation of the formula can be used to predict AGL in mesocephalic cross-bred dogs: AGL = 10.847 * age in weeks 0.1653.
Tuntivanich
N
N
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824, USA.
Petersen-Jones
Simon M
SM
Steibel
Juan P
JP
Johnson
C
C
Forcier
Janice Q
JQ
D000818:Animals; D000831:Animals, Newborn / Q000033:anatomy & histology / Q000254:growth & development; D001699:Biometry; D004285:Dogs / Q000033:anatomy & histology / Q000254:growth & development*; D005123:Eye / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000254:growth & development*; D005260:Female; D008297:Male; D009915:Orbit / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000254:growth & development*; D012016:Reference Values; D014463:Ultrasonography