Abstract

Ocular biometry, using A-scan ultrasonography and ultrasonographic pachymetry, was performed in 52 Samoyeds, 2 months to 13 years old, without: intraocular or systemic diseases. Furthermore, the relative depth of the opening of the ciliary cleft was estimated from goniophotographs. The values were analyzed, and statistical models of changes in ocular distances with increasing age were identified. It was found that the changes in corneal thickness, axial anterior chamber depth, lens thickness, relative lens position, length of the vitreous body, and axial length could best be described by 1 of the 2 nonlinear models f(x)=alpha+beta/x+gamma x+epsilon and f(x)=alpha+beta/x+gamma log x+epsilon. The course began with a period of rapid increase, after which the ocular distance either increased at a progressively slower rate toward infinity (corneal and lens thickness) or to a finite limit (relative lens position and axial length), or ceased to grow and finally started to decrease toward minus infinity (axial anterior chamber depth and length of the vitreous body). However, suitable model for determining relative depth of the opening of the ciliary cleft could not be established. Results indicated;that age-related changes, mainly in lens thickness, cause a shallow anterior chamber, and it was suggested that this may be of importance for development of a relative pupillary block and, thus, primary angle-closure glaucoma, at least in preconditioned eyes of Samoyeds.

Published in

American Journal of Veterinary Research
1995, Volume: 56, number: 1, pages: 127-133
Publisher: AMER VETERINARY MEDICAL ASSOC

SLU Authors

• Ekesten, Björn

  • Department of Medicine and Surgery, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Clinical Science


Permanent link to this page (URI)

https://res.slu.se/id/publ/107281