Corneal Thickness and Diameter in the Domestic Cat

Abstract

Two sample groups of domestic cats were assessed for (a) central corneal thickness (17 eyes), using optical pachymetry, and (b) horizontal and vertical corneal diameter, using a photographic method (20 eyes). The average corneal thickness was 0.755 +/- 0.33 mm. The mean horizontal diameter was 16.5 +/- 0.60 mm and the mean vertical diameter was 16.2 +/- 0.61 mm. The horizontal corneal diameter was significantly greater than the vertical corneal diameter (p less than 0.001, paired t test).

Intra and inter‐user reliability of central corneal thickness measurements obtained in healthy feline eyes using a portable spectral‐domain optical coherence tomography device

“…The CCT of normal feline eyes in the current report was found to be 629.08 ± 47.05 μm, a value higher than previously reported in the majority of studies . Using ultrasonic pachymetry, Gilger et al .…”

“…Carrington et al., however, found a mean CCT of 755 ± 30 μm using a slit‐lamp‐based optical pachymeter in nine healthy cats, whereas Kafarnik et al . reported the mean CCT of the feline eye to be 592 ± 80 μm using in vivo confocal microscopy . Such discrepancies within the veterinary literature regarding CCT of the feline eye largely reflect the imaging modality employed for data acquisition.…”

“…The CCT of normal feline eyes in the current report was found to be 629.08 AE 47.05 lm, a value higher than previously reported in the majority of studies. [17][18][19][20][21] 17,20 Such discrepancies within the veterinary literature regarding CCT of the feline eye largely reflect the imaging modality employed for data acquisition. Additionally, this variability is compounded by alterations in parameters utilized by each imaging modality.…”

A Short-Term In Vivo Experimental Model for Fuchs Endothelial Corneal Dystrophy

“…47 Endothelial cell density 48,49 and corneal thickness values are comparable to human values. 50,51 The large corneal diameter of the cat cornea (15.5-18 mm) 48,52 permits full size grafts, using the same instrumentation and techniques as for human subjects. These large grafts also yield large amounts of tissue for postmortem analyses.…”

Refractive Index of the Mammalian Cornea and Its Influence During Pachometry

“…In their recent paper on the thickness and diameter of the cat cornea, Carrington and Woodward (1986) state that Valentin (1879) found a value of 1.3795 for the refractive index of the cat cornea, although they themselves used a value of 1.376. They went on to conclude, on the basis of the work of Arner and Rengstorff (1972), that large variations in the corneal refractive index would have to occur before any significant error was produced in the accuracy of pachometry.…”