Jan A. Venter

ORCID: 0000-0002-4548-2571
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About
Contact & Profiles
Research Areas
  • Wildlife Ecology and Conservation
  • Corneal surgery and disorders
  • Ophthalmology and Visual Impairment Studies
  • Intraocular Surgery and Lenses
  • Rangeland Management and Livestock Ecology
  • Pleistocene-Era Hominins and Archaeology
  • Glaucoma and retinal disorders
  • Ecology and Vegetation Dynamics Studies
  • Avian ecology and behavior
  • Evolution and Paleontology Studies
  • Species Distribution and Climate Change
  • Animal Ecology and Behavior Studies
  • Ocular Surface and Contact Lens
  • Primate Behavior and Ecology
  • Geology and Paleoclimatology Research
  • Genetic and phenotypic traits in livestock
  • Ocular Infections and Treatments
  • Animal Behavior and Welfare Studies
  • Animal Behavior and Reproduction
  • Fish Ecology and Management Studies
  • Marine and fisheries research
  • Ecology and biodiversity studies
  • Animal and Plant Science Education
  • Wildlife-Road Interactions and Conservation
  • Environmental and Biological Research in Conflict Zones

Nelson Mandela University
2016-2025

University of Pretoria
1959-2024

Centre National de la Recherche Scientifique
2019-2024

Université Claude Bernard Lyon 1
2019-2024

Sokoine University of Agriculture
2023

Arizona State University
2023

University of California, San Francisco
2015-2021

Nelson Mandela Academic Hospital
2021

Carl Zeiss (United States)
2021

Hannan University
2020

To report the effectiveness, patient satisfaction, and complication rate with a zonal refractive intraocular lens (IOL) in high volume of patients.Private clinic, London, United Kingdom.Case series.Retrospective data patients binocular Lentis Mplus IOLs were analyzed. The main outcome measures uncorrected distance visual acuity (UDVA), near (UNVA), corrected acuity, manifest refraction, complications. One-month, 3-month, 6-month analyzed.The study comprised 9366 eyes 4683 patients. mean...

10.1016/j.jcrs.2013.03.035 article EN Journal of Cataract & Refractive Surgery 2013-07-13

To evaluate the effect of residual astigmatism on postoperative visual acuity and satisfaction after intraocular lens (IOL) surgery.Private practice, United Kingdom.Retrospective case series.Postoperative data patients who had previously undergone refractive exchange or cataract surgery were used in a multivariate regression model to assess 3 months monocular uncorrected distance (UDVA) patient satisfaction. The analysis was based refraction dominant eye each patient. Odds ratios calculated...

10.1097/j.jcrs.0000000000000560 article EN Journal of Cataract & Refractive Surgery 2020-12-19

ABSTRACT Facultative scavenging can be observed across a large range of carnivorous mammals but is an uncommon behavioural trait in cheetahs ( Acinonyx jubatus ). Very few incidents have been reported, with no explanation given as to why it may occur. In this paper, we provide three more observations between 2019 and 2023 different protected areas South Africa Malawi. We suggest common factor these observations, namely that all adult individuals involved were temporarily housed holding...

10.1002/ece3.70776 article EN cc-by Ecology and Evolution 2025-01-01

PURPOSE: To assess efficacy, safety, predictability, and patient satisfaction after refractive lens exchange with a new rotational asymmetric multifocal intraocular lens. METHODS: One hundred six eyes of 53 patients bilateral the SBL-3 (Lenstec, Inc., Christ Church, Barbados) implantation were evaluated. The mean preoperative sphere was +1.06 ± 2.63 diopters (D) (range: −8.25 to +5.00 D) cylinder −0.51 0.46 D −2.00 0.00 D). Monocular binocular uncorrected corrected distance visual acuity,...

10.3928/1081597x-20141021-09 article EN Journal of Refractive Surgery 2014-11-01

Purpose: To assess the safety, efficacy, predictability, and refractive outcome of implanting Ophtec Artisan phakic intraocular lenses (pIOLs) in eyes with keratoconus. Methods: In this retrospective study, 18 11 patients diagnosed keratoconus who underwent toric or myopic pIOL implantation were followed for 1 year postoperatively. Mean patient age was 41±10.97 years (range: 23 to 64 years). Preoperative manifest sphere −4.64±2.74 diopters (D) −9.75 0.00 D) cylinder −3.07±2.04 D −7.75 −0.50...

10.3928/1081597x-20090813-01 article EN Journal of Refractive Surgery 2009-09-01

Part of the phytolith analysis was supported by the Ministerio de Ciencia e Innovacion (HAR2010-15967 to Albert). The field survey funded by a grant from the National Geographic Society / Waitt Foundation (W160-11 to Fisher)

10.4207/pa.2013.art82 article EN 2013-01-01

To report the outcomes of correction mixed astigmatism with non-penetrating femtosecond laser intrastromal astigmatic keratotomy in patients previous refractive surgery.One hundred twelve eyes that had low after excimer surgery, lens exchange, or phakic intraocular implantation underwent using paired symmetrical arcuate keratotomies created 60 μm from surface to 80% depth at 7 mm diameter. Outcome measures included uncorrected distance visual acuity (UDVA), corrected (CDVA), subjective...

10.3928/1081597x-20130129-09 article EN Journal of Refractive Surgery 2013-02-28

Nile crocodile ( Crocodilus niloticus ) mass mortality events in the Olifants River between Letaba confluence South Africa and Lake Massingir Mozambique have been attributed to pansteatitis: a disease that affects fat depots of animals. The is also found sharptooth catfish Clarias gariepinus same area, cause pollution. Although Valley polluted, impact interventions such as dam construction on biodiversity receives little attention. We show onset pansteatitis epidemic crocodiles at...

10.1890/es12-00170.1 article EN Ecosphere 2012-10-01

To provide an initial retrospective evaluation of early postoperative outcomes after wavefront-guided myopic LASIK using a new-generation Hartmann-Shack wavefront sensor.A noncomparative, study 243 eyes 126 patients that underwent primary LASIK, data obtained with new aberrometer (iDesign Advanced WaveScan aberrometer; Abbott Medical Optics, Inc., Santa Ana, CA). Visual acuity, refraction, and patient satisfaction were evaluated 1 month surgery.The manifest spherical equivalent was reduced...

10.3928/1081597x-20131029-02 article EN Journal of Refractive Surgery 2014-01-01

To evaluate outcomes and the incidence of adverse events (AEs) in patients who underwent bilateral same-day refractive lens exchange (RLE).Retrospective case series.Patients a private intraocular surgery provider United Kingdom RLE both eyes on same day with treatment dates between March 2018 December 2021.Clinical AEs were collected for continuous cohort undergoing (in absence visually significant cataracts) or had mild cataracts (corrected visual acuity ≥ 20/40). One-month clinical...

10.1016/j.ophtha.2023.04.013 article EN cc-by-nc-nd Ophthalmology 2023-04-20

To compare the outcomes of Tecnis Eyhance ICB00 IOL, designed to enhance intermediate vision, a conventional Monofocal ZCB00 IOL.

10.2147/opth.s456332 article EN cc-by-nc Clinical ophthalmology 2024-05-01

Abstract Megaherbivore carcasses represent sporadic but energetically rewarding resources for carnivores, offering a unique opportunity to study coexistence dynamics between facultative scavengers. South African fenced protected areas, such as Madikwe Game Reserve (Madikwe hereafter), host viable populations of large carnivores and high densities elephants, Loxodonta africana . However, carnivore can lead potentially fatal interspecific encounters increased competition, particularly around...

10.1002/ece3.11373 article EN Ecology and Evolution 2024-05-01

To determine the safety and efficacy of wavefront-guided LASIK for correction low to moderate myopia, as performed by surgeons employed Optical Express, a large corporate provider.Data were extracted from Express central database on 22,900 patients (42,143 eyes) who underwent primary treat myopia and/or astigmatism. All treatments used ablation profile had refractive target emmetropia. Outcomes evaluated using 1-month follow-up data, which available 32,569 eyes 17,713 (77% follow-up)....

10.3928/1081597x-20090611-02 article EN Journal of Refractive Surgery 2009-07-01

To determine the relationship between low-light pupil size and patient-reported outcomes 1 month after wavefront-guided LASIK in young patients with myopia.Retrospective case series of 10,944 eyes 5,563 myopia who underwent (6.0-mm optical zone). Preoperative was measured under conditions an infrared pupillometer. Visual refractive were evaluated at postoperatively. A questionnaire administered to assess including satisfaction procedure, night driving, glare halo visual symptoms.The average...

10.3928/1081597x-20140217-02 article EN Journal of Refractive Surgery 2014-03-01

To analyze results of wavefront-guided laser vision correction retreatments performed either by lifting the original flap or surface ablation over flap.Optical Express, Glasgow, United Kingdom.Retrospective case series.This retrospective study included patients grouped according to whether they had lift enhancement photorefractive keratectomy (PRK) LASIK flap. All retreatment procedures were with Visx Star S4 IR excimer profile derived from iDesign aberrometer. Visual acuities, refractive...

10.1016/j.jcrs.2015.05.031 article EN Journal of Cataract & Refractive Surgery 2015-11-01

To evaluate the efficacy, safety, predictability, and patient satisfaction after refractive lens exchange with a zonal intraocular (IOL) an inferior reading addition in emmetropic patients.Optical Express, London, United Kingdom.Retrospective case series.Emmetropic presbyopic patients who had implantation of Lentis Mplus LS-313 MF30 IOL were evaluated. Inclusion criteria sphere between -0.50 diopter (D) +1.00 D no more than 0.75 cylinder uncorrected distance visual acuity (UDVA) 6/6 or...

10.1016/j.jcrs.2014.06.035 article EN Journal of Cataract & Refractive Surgery 2015-02-26

To assess vision-related, quality-of-life outcomes 5 years after laser in situ keratomileusis (LASIK) and determine factors predictive of patient satisfaction.Optical Express, Glasgow, Scotland.Retrospective case series.Data from patients who had attended a clinical examination LASIK were analyzed. All treatments performed using the Visx Star S4 IR excimer laser. Patient-reported satisfaction, effect eyesight on various activities, visual phenomena, ocular discomfort evaluated...

10.1016/j.jcrs.2016.03.032 article EN Journal of Cataract & Refractive Surgery 2016-06-01

The object of this trial was to determine the efficacy in peribulbar anesthesia bupivacaine 0.5%, 0.75%, and a combination 0.5% lignocaine 2% equal parts. Fifty-one 50 patients random order were injected with 0.75% bupivacaine, respectively, another lignocaine/bupivacaine mixture. results recorded all data statistically analyzed. We concluded that route agents used not successful technique. Our criterion for block, i.e., akinesia, achieved more than 54% cases.

10.1016/s0886-3350(13)80286-6 article EN Journal of Cataract & Refractive Surgery 1993-01-01
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