<i>In vivo</i> measurement of central corneal thickness in normal chicks (<i>Gallus gallus domesticus</i>) with the optical low‐coherence reflectometer

Tappeiner, Christoph; Goldblum, David; Κatsoulis, Κonstantinos; Sarra, Gian-Marco; Frueh, Béatrice E.

doi:10.1111/j.1463-5224.2011.00875.x

Cited by 4 publications

(6 citation statements)

References 27 publications

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“…It is a fully automated partial interferometry system, and is considered the fi rst optical biometer that uses optical low-coherence refl ectometry, a technology similar to time-domain optical coherence tomography (OCT), for all measurements, including CCT, ACD, and crystalline lens thickness. 8 Thus, the WaveLight OB820 is considered a biometer of the entire eye, 9 as one scan consists of 16 individual full eye scans and 4 individual keratometric scans, taken on 2 concentric rings, along the eye's visual axis.…”

Section: Discussionmentioning

confidence: 99%

Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Kanellopoulos¹,

Asimellis²

2012

J Refract Surg

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Our data show that the Oculyzer II and WaveLight OB820 provide measurements that are in agreement with published values for CCT and ACD in patients. Excellent agreement for CCT and ACD was found between the two devices, as demonstrated by a high degree of correlation and linearity, in addition to minimal bias. Thus, CCT, ACD, and K measurements by these instruments can both be used in clinical preparation, and their agreement is an ensuring precision factor for cataract and refractive surgeons.

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Section: Discussionmentioning

confidence: 99%

Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Kanellopoulos¹,

Asimellis²

2012

J Refract Surg

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“…In vivo corneal morphometric data for myopia and refractive surgery research can be obtained by measuring in living animals 34–36 . Because of avians' corneal stroma's lamellar shape and inclination to compress and stretch during cutting and transfer to a microscope slide, histological measurements of CCT are frequently inconsistent 37 . As a result, pachymetric central thickness measurement is preferable in terms of more precise results and a non‐invasive technique that may be employed without a post‐mortem examination 38–41 .…”

Section: Discussionmentioning

confidence: 99%

“…Ultrasound pachymetry (UP) is more preferred in human and veterinary ophthalmology as it is more reliable 38–40 . Previous studies measured overall mean CCT 190.1 ± 12.6 μm and 242 ± 0.04 μm in 1‐day‐old chicks and 70‐day‐old chickens 37,42 . To the authors' knowledge, no published work has been conducted to determine the CCT values of 42‐day‐old broilers and evaluate the effect of varying light intensities (5, 20, and 80 lux) on CCT values.…”

Section: Discussionmentioning

confidence: 99%

“…[34][35][36] Because of avians' corneal stroma's lamellar shape and inclination to compress and stretch during cutting and transfer to a microscope slide, histological measurements of CCT are frequently inconsistent. 37 As a result, pachymetric central thickness measurement is preferable in terms of more precise results and a noninvasive technique that may be employed without a postmortem examination. [38][39][40][41] Ultrasound pachymetry (UP) is more preferred in human and veterinary ophthalmology as it is more reliable.…”

Section: Discussionmentioning

confidence: 99%

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Effect of light intensity on the tear production, central corneal thickness, and intraocular pressure in broiler chickens

Yaygingül

Fidan

OKUR

et al. 2022

Veterinary Ophthalmology

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Objective:The objective of the present study was to examine the effect of different light intensities on tear production, corneal thickness, and intraocular pressure in broilers.Animals studied: Both eyes of 72 male broilers were evaluated in this study. Materials and Methods: Broilers were divided into the following three groups: low light intensity (n = 24, 5 lux), moderate light intensity (n = 24, 20 lux), and high light intensity (n = 24, 80 lux). The eyes of all birds (n = 72) underwent a complete ophthalmic examination, which included the Schirmer tear test (STT-I), intraocular pressure (IOP), and the central cornea thickness measurement (CCT). The effect of light intensity on the Schirmer test, intraocular pressure, and central corneal thickness values was examined at eye and animal level (right and left eyes separately and cumulatively/no distinguishing left or right) by using one-way ANOVA.Results: At the animal level, without discrimination of left and right eye measurements, statistically significant differences were found between 5-20 and 20-80 lux groups on IOP measurements (p < .05). The difference in CCT measurements between the 5 and 20 lux groups was statistically significant (p < .05), and the corneal thickness of the 5 lux group animals was found to be statistically significant and higher than the 20 lux group (p < .05). Conclusions:In conclusion, light intensity has an influence on eye health in broilers. Present results may attribute to the future studies as a reference value for broilers raised under different light intensities.

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“…Several studies have shown that the anatomy and histology of the chick AS tissues are similar in size and appearance to human tissues. [9101516] Fowler WC et al . showed that despite the difference in collagen content, chicken corneas have the closest histologic features to humans.…”

Section: Discussionmentioning

confidence: 99%

The novel model: Experimental optical coherence tomography–guided anterior segment imaging chick embryo model

Ertekın

Duman

Aslan

et al. 2019

Indian J Ophthalmol

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Purpose:The aim of this study was to present an experimental optical coherence tomography (OCT)–guided anterior segment (AS) imaging chick embryo model. Through this model, we aimed to reveal similarities and differences between human cornea, AS tissues, and chick embryo tissues by quantitative image analysis.Methods:Ex vivo, the chick embryos’ globes were determined by detailed AS camera of spectral-domain (SD)-OCT in 10 fertilized specific pathogen-free eggs on the 20th day. Quantitative image analysis of anterior chamber tissues was performed with SD-OCT in detail. After imaging, cross sections of the chick embryo globes containing cornea with anterior chamber were histologically examined and compared with human tissues. The similarities of our model with data in the human cornea and AS studies in the literature were compared.Results:SD-OCT imaging was able to successfully delineate the AS tissues of chick embryos such as the cornea, iris, lens, pupil, conjunctiva, ciliary body, anterior chamber, and lens. Quantitative semi-automated measurements showed the following: mean central corneal thickness: 213.4 ± 7.05 μm (197–223 μm), mean anterior chamber depth: 878.9 ± 41.74 (804–919 μm), mean anterior chamber area: 2.43 ± 0.16 mm2 (2.17–2.73 mm2), mean corneoscleral junction (limbal) thickness: 322.8 ± 20.05 μm (289–360 μm), and mean iris thickness: 230.4 ± 13.27 μm (203–245 μm). In addition, detailed histological comparisons of the AS tissues with human tissues were evaluated to be very similar.Conclusion:In conclusion, this chick embryo model mimics human tissues and it can be considered as a platform for the study of teratogen-induced malformations and AS dysgenesis during gestation of AS tissues. In addition, this study demonstrates the feasibility of SD-OCT in the quantitative assessment of AS structures in chick embryo model.

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In vivo measurement of central corneal thickness in normal chicks (Gallus gallus domesticus) with the optical low‐coherence reflectometer

Cited by 4 publications

References 27 publications

Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Correlation Between Central Corneal Thickness, Anterior Chamber Depth, and Corneal Keratometry as Measured by Oculyzer II and WaveLight OB820 in Preoperative Cataract Surgery Patients

Effect of light intensity on the tear production, central corneal thickness, and intraocular pressure in broiler chickens

The novel model: Experimental optical coherence tomography–guided anterior segment imaging chick embryo model

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