Evaluation of ultrasound velocity in enucleated equine aqueous humor, lens and vitreous body.
Authors: Meister Ulrike, Ohnesorge Bernhard, Körner Daniel, Boevé Michael H
Journal: BMC veterinary research
Summary
# Editorial Summary Accurate biometric measurements of equine eyes—particularly anterior chamber depth, lens thickness and axial length—are essential for intraocular lens (IOL) implantation planning, yet this requires knowledge of ultrasound velocity through different ocular tissues, data that was previously unavailable for horses. Meister and colleagues measured A-mode ultrasound velocity in enucleated tissue samples from 35 healthy equine eyes (33 lenses, 29 aqueous humour samples and 31 vitreous samples), examining how velocity varied with age, temperature, gender and post-enucleation time. The authors established baseline ultrasound velocity values for equine aqueous humour, lens and vitreous—parameters that had not been previously documented in the equine literature—and characterised how these values change under different conditions relevant to clinical and laboratory settings. These tissue-specific velocity measurements now provide the essential calibration data required for practitioners performing A-mode ultrasonography in equine ophthalmology, enabling more precise intraocular biometry for surgical planning and improving the accuracy of IOL power calculations in horses undergoing cataract surgery. The findings are particularly relevant for equine practitioners undertaking advanced ophthalmic imaging or considering surgical lens replacement in cases where accurate axial measurements are critical to surgical success.
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Practical Takeaways
- •Practitioners performing equine cataract surgery with IOL implantation now have species-specific ultrasound velocity data to improve biometric calculations and surgical outcomes
- •Understanding how temperature and post-enucleation time affect ultrasound velocity helps standardize measurement protocols for consistent IOL calculations
- •A-mode ultrasound can now be reliably used to measure anterior chamber depth, lens thickness, vitreous length, and total axial globe length in horses with appropriate velocity corrections
Key Findings
- •Ultrasound velocity measurements were successfully obtained from equine aqueous humor, lens, and vitreous body samples across 35 healthy eyes
- •Velocity values were analyzed in relation to age, temperature, gender, and post-enucleation time to establish reference standards for equine ocular tissues
- •These baseline velocity measurements enable accurate A-mode ultrasound determination of intraocular distances required for IOL power calculations in horses