A Morphometric Study of the Pars Plana of the Ciliary Body in Human Cadaver Eyes

Author:

Guedes Jaime123,Fernandes Bruno F.4ORCID,Mora-Paez Denisse J.2,Brazuna Rodrigo5,da Costa Neto Alexandre Batista5ORCID,Amaral Dillan Cunha1ORCID,Faneli Adriano Cypriano6ORCID,Oliveira Ricardo Danilo Chagas37,de Alencar Costa Filho Adroaldo1,Dantas Adalmir Morterá1

Affiliation:

1. Department of Ophthalmology, Federal University of Rio de Janeiro, Rio de Janeiro 21941-971, RJ, Brazil

2. Glaucoma Research Center, Wills Eye Hospital, Philadelphia, PA 19107, USA

3. Ophthalmology, Opty Group, Rio de Janeiro 22640-100, RJ, Brazil

4. Argumento Institute, Boucherville, QC J4B-2G6, Canada

5. Department of Ophthalmology, Federal University of the State of Rio de Janeiro, Rio de Janeiro 22290-240, RJ, Brazil

6. Bahiana School of Medicine and Public Health, Salvador 40290-000, BA, Brazil

7. Department of Ophthalmology, Federal University of Bahia, Salvador 40170-110, BA, Brazil

Abstract

This study aimed to determine the pars plana length in postmortem human eyes using advanced morphometric techniques and correlate demographics to ocular metrics such as age, sex, ethnicity, and axial length. Between February and July 2005, we conducted a cross-sectional observational study on 46 human cadaver eyes deemed unsuitable for transplant by the SBO Eye Bank. The morphometric analysis was performed on projected images using a surgical microscope and a video-microscopy system with a 20.5:1 correction factor. The pars plana length was measured three times per quadrant, with the final value being the mean of these measurements. Of the 46 eyes collected, 9 were unsuitable for the study due to technical constraints in conducting intraocular measurements. Overall, the average axial length was 25.20 mm. The average pars plana length was 3.8 mm in all quadrants, with no measurements below 2.8 mm or above 4.9 mm. There were no statistically significant variations across quadrants or with age, sex, axial length, or laterality. Accurately defining the pars plana dimensions is crucial for safely accessing the posterior segment of the eye and minimizing complications during intraocular procedures, such as intravitreal injections and vitreoretinal surgeries.

Publisher

MDPI AG

Reference34 articles.

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3. Omari, A., and Mahmoud, T.H. (2023). Vitrectomy, StatPearls Publishing.

4. Pars plana and ora serrata anatomotopographic study of fetal eyes;Bonomo;Acta Ophthalmol.,1989

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