Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes)
Dissertation (MMedVet (Ophthalmology))--University of Pretoria, 2020.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2022
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613570644049920 |
|---|---|
| access_status_str | Open Access |
| author2 | Steenkamp, Gerhardus |
| author_browse | Steenkamp, Gerhardus |
| author_facet | Steenkamp, Gerhardus |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MMedVet (Ophthalmology))--University of Pretoria, 2020. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/83211 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:15.015Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/83211 Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) Steenkamp, Gerhardus u04297385@tuks.co.za Venter, Izak J. Dobbie, Keri-Lee Shannon UCTD Dissertation (MMedVet (Ophthalmology))--University of Pretoria, 2020. Purpose. To perform a descriptive investigation of the chimpanzee (Pan troglodytes) eye, conduct selected ophthalmic diagnostic tests, document intraocular measurements and determine the intraocular lens (IOL) power for this species. Methods. Thirty-three anaesthetised captive chimpanzees (20 females with a mean age of 21.8 ± 7.06 years and a median age of 15 years, 13 males with a mean age of 16.4 ± 17.48 years and a median age of 15 years) underwent ophthalmic examination as part of routine health examinations. Selected diagnostic tests performed: intraocular pressure (IOP) by rebound tonometry (TonoVet®), central corneal thickness (CCT) by ultrasonic pachymetry, keratometry using a handheld automatic keratometer, A- and B-mode ultrasonography. IOL power was calculated using the Retzlaff and Binkhorst theoretical formulas. Results. Most common ophthalmic findings (eyes): iridal melanosis (11), dyscoria (3) and mature cataracts (2). IOP: 22.59 ± 5.34 mmHg (“d” setting), 14.34 ± 4.03 mmHg (“P” setting). Mean horizontal corneal radius: 7.35 ± 0.47, mean vertical corneal radius: 6.55 ± 0.55 mm. Mean horizontal and vertical corneal curvatures were 46.19 ± 2.80 D and 51.74 ± 4.39 D respectively. CCT: 0.45 ± 0.04 mm. No significant differences were found between right and left eyes, age or sex for any parameter evaluated except for a sex difference in IOP where males had lower IOP than females. Ocular biometry: axial globe length: 21.41 ± 0.76 mm, anterior chamber depth (ACD): 3.63 ± 0.47 mm, crystalline lens thickness (LT): 3.81 ± 0.68 mm, posterior segment depth: 13.98 ± 1.00 mm. The estimated postoperative ACD (PACD) was calculated as ACD + 0.5 x LT. To address the effect of IOL position on lens power, additional calculations using PACD +2mm and PACD -2mm were performed. Calculated IOL powers (using the Retzlaff and Binkhorst formulas respectively): PACD: 21.86 ± 5.73 D and 22.81 ± 5.79 D; PACD +2mm: 27.67 ± 7.36 D and 28.83 ± 7.43 D; PACD -2mm: 17.71 ± 4.59 D and 18.51 ± 4.65 D. Conclusions. Normal parameters described in this study will aid in the identification of ocular pathology in chimpanzees. Determination of the IOL power will facilitate correct IOL selection for the phacoemulsification candidate, although further studies evaluating pseudophakic refraction and determination of actual PACD are required. Veterinary Tropical Diseases MMedVet (Ophthalmology) Unrestricted 2022-01-12T06:00:17Z 2022-01-12T06:00:17Z 2021/04/16 2020 Dissertation * A2021 http://hdl.handle.net/2263/83211 en © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title | Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title_full | Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title_fullStr | Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title_full_unstemmed | Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title_short | Ocular findings and intraocular lens power in captive chimpanzees (Pan troglodytes) |
| title_sort | ocular findings and intraocular lens power in captive chimpanzees pan troglodytes |
| topic | UCTD |
| url | http://hdl.handle.net/2263/83211 |