Comparison of central corneal thickness in dogs measured by ultrasound pachymetry and ultrasound biomicroscopy

Martín-Suárez, Eva; Galán, Alba; Morgaz, Juán; Guisado, Alicia; Gallardo, J.M.; Gómez-Villamandos, R.J.

doi:10.1016/j.tvjl.2017.12.003

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…However, in a previous study conducted under the same conditions, no marked changes in CCT or corneal edema were observed over time or with increasing manometric pressure in the eyes of dogs that had been euthanized ~1‐6 hours prior to testing and maintained at 4°C in a humid environment, as in the present study (McLellan, unpublished data). Furthermore, the CCT of the canine eyes in that study all fell within the previously published normal range for canines 33 . However, the authors acknowledge that the accuracy and precision of the devices tested in the current study may prove to be different when tested in living animals, particularly in animals with ocular abnormalities or disease.…”

Section: Discussionsupporting

confidence: 67%

Validation and comparison of four handheld tonometers in normal ex vivo canine eyes

Minella

Kiland

Gloe

et al. 2020

Veterinary Ophthalmology

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Objectives To determine the accuracy and precision of the Icare® TONOVET Plus rebound tonometer and the Tono‐Pen AVIA Vet™ applanation tonometer for intraocular pressure (IOP) measurement in normal ex vivo canine eyes and comparison to earlier models of these tonometers. Animals & procedures The anterior chambers of six normal dog eyes were cannulated ex vivo. IOP was measured with the TONOVET (TV01), TONOVET Plus, Tono‐Pen Vet™, and Tono‐Pen AVIA Vet™ at manometric IOPs ranging from 5 to 70 mm Hg. Data were analyzed by linear regression, ANOVA and Bland‐Altman plots. A P value ≤ .05 was considered significant. Results Intraocular pressure values obtained using the TONOVET Plus and TV01 were significantly more accurate than with the Tono‐Pen VET and Tono‐Pen AVIA Vet, particularly at higher IOPs (30‐70 mm Hg). Accuracy was not significantly different between any of the devices in the low to normal physiologic IOP range (5‐25 mm Hg). Level of precision was high for all devices, though the TONOVET Plus was more precise than the Tono‐Pen Vet in the 5‐25 mmHg range and the TV01 was more precise than the Tono‐Pen AVIA Vet over the whole IOP range. Conclusions All devices underestimated IOP, particularly at higher pressures. Rebound tonometers were more accurate over the full range of IOP tested and in the high IOP range; however, there were no significant differences in accuracy among devices in the physiologic IOP range. All tonometers can provide clinically useful IOP readings in dogs, but rebound and applanation tonometers should not be used interchangeably.

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Section: Discussionsupporting

confidence: 67%

Validation and comparison of four handheld tonometers in normal ex vivo canine eyes

Minella

Kiland

Gloe

et al. 2020

Veterinary Ophthalmology

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“…The current study identified that corneal thickness in horses determined by ultrasound biomicroscopy was greater relative to ultrasonic pachymetry at all corneal locations. This differs from a recent report in dogs in which the two techniques were found to produce similar central corneal thickness measurements with strong agreement between methods 21 . Another study that compared ultrasonic pachymetry to UBM in the assessment of corneal thickness of frozen canine corneas indicated that UBM consistently resulted in greater corneal thickness measurements 22 .…”

Section: Discussioncontrasting

confidence: 83%

“…This differs from a recent report in dogs in which the two techniques were found to produce similar central corneal thickness measurements with strong agreement between methods. 21 Another study that compared ultrasonic pachymetry to UBM in the assessment of corneal thickness of frozen canine corneas indicated that UBM consistently resulted in greater corneal thickness measurements. 22 As previously discussed, the accuracy of ultrasonic pachymetry in determination of corneal thickness is dependent upon the set velocity of the instrument being consistent with the speed of sound through the measured tissue.…”

Section: Discussionmentioning

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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Eye

Clode¹,

Mattoon²

2021

Small Animal Diagnostic Ultrasound

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Comparison of central corneal thickness in dogs measured by ultrasound pachymetry and ultrasound biomicroscopy

Cited by 3 publications

References 9 publications

Validation and comparison of four handheld tonometers in normal ex vivo canine eyes

Validation and comparison of four handheld tonometers in normal ex vivo canine eyes

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

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