Advanced Ophthalmic Imaging in the Horse

Ledbetter, Eric C.; Porter, Ian

doi:10.1002/9781119782285.ch2

Cited by 1 publication

(1 citation statement)

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“…Based on the ease of portability and increasing affordability, UBM has become a practical advanced imaging technique for use in equine ophthalmology. Clinical applications of UBM to investigate equine ocular pathology reported thus far include Descemet's membrane detachment, corneolimbal squamous cell carcinoma, stromal abscesses, and a corneal foreign body 6–8 …”

Section: Introductionmentioning

confidence: 99%

Corneal thickness and anterior chamber depth of the normal adult horse as measured by ultrasound biomicroscopy

Knickelbein

Lassaline

Kim

et al. 2022

Veterinary Ophthalmology

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Objective: To determine corneal thickness (CT) and axial anterior chamber depth (ACD) using ultrasound biomicroscopy (UBM) in normal adult horses. To compare corneal thickness measurements between UBM and ultrasonic pachymetry.Animals studied: Sixty eyes of 30 healthy adult horses aged 8-24 years.Procedures: Ultrasonic pachymetry (velocity of 1640 m/s) was utilized to obtain measurements of the central, superior, temporal, inferior, and nasal cornea. Triplicate images of the same corneal locations were acquired using UBM (50 MHz). Images of the axial anterior chamber were used to measure ACD.Intraocular pressure (IOP) was estimated using rebound tonometry, and axial globe length was measured using ultrasonographic biometry.Results: CT (mean ± SD µm) measured by UBM was 854 ± 61 (central), 994 ± 58 (superior), 930 ± 57 (temporal), 979 ± 55 (inferior), and 898 ± 48 (nasal). CT measured by UBM was greater than that measured by ultrasonic pachymetry at all locations and was statistically significant at all locations except inferior (p = 0.0006-0.048). No sex nor age effect was detected for CT at any location. The repeatability of ultrasonic pachymetry was superior to that of UBM. Mean ± SD ACD was 5.74 ± 0.41 mm. A weak positive correlation was identified between central CT and IOP and between central CT and axial globe length.Conclusions: Normal data for CT and ACD of the adult horse obtained using UBM are provided. CT determined by UBM was greater relative to pachymetry at all corneal locations.

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Section: Introductionmentioning

confidence: 99%