A pre-test post-test assessment of non-invasive keratograph break  up time and corneal epithelial thickness after vaping

Background: The effects of electronic cigarettes on the ocular surface has yet to be shown. The purpose of the study was to assess the impact of e-cigarette use on the anterior corneal surface integrity.Methods: Forty three males and 21 females with an average of 21years were required to vape 0.05ml of e-liquid of 8mg nicotine concentration. Corneal epithelial thickness (CET) and Non Invasive Keratograph Tear Break up Time (NIKBUT) measurements were obtained prior to and post vaping. The Optovue iVue optical coherence topographer was used to measure central; superior; inferior; nasal and temporal CET and NIKBUT was assessed using the Oculus Keratograph 5M.Results: There was a mean increase for central corneal epithelial thickness of 0.3448 microns. The superior CET increased by 0.2414 microns. The inferior CET increased by 0.2931microns. The nasal CET increased by 0.2069 microns. The temporal CET increased by 0.2759 microns. The mean change in NIKBUT post-vaping was an increase of 1.40 seconds. All observations occurred at p > 0.05.Conclusion: The acute effect of e-cigarette use does not impact corneal epithelial thickness and non-invasive keratography tear break up time after 10 puffs mild exposure but more research is needed to assess if this remains the case with more frequent, higher exposure.Keywords: Pre-test post-test assessment, non-invasive keratograph breakup time, corneal epithelial thickness, vaping.

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The effect of PRK on corneal epithelium thickness and pachmetry in treatment of myopia.

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v9ispl1.1285 ◽

2018 ◽

Vol 9 (SPL1) ◽

Author(s):

Furkaan Majied Hamied ◽

Deyaa Neama Kadhim ◽

Sohaib A Mahmood

Keyword(s):

Refractive Error ◽

Anterior Segment ◽

Thickness Change ◽

Corneal Epithelial ◽

Epithelial Thickness ◽

Refractive Outcomes ◽

Epithelium Thickness ◽

Profile Changes ◽

Corneal Epithelial Thickness ◽

Myopic Astigmatism

In order to facilitate the corneal stromal ablation in photorefractive keratectomy the epithelium is removed so corneal repair associated with changes in epithelium and stroma. To study the corneal epithelial thickness and pachymetry profile changes after photorefractive keratectomy (PRK) for myopia. Retrospective analysis of the postoperative corneal epithelial thickness and pachymetry profile changes in 22 eyes of 12 patients treated with PRK for myopia or myopic astigmatism. Corneal and epithelial thickness maps within the central 6 mm were obtained by anterior segment spectral-domain optical coherence tomography (SD-OCT) preoperatively and at 3 months postoperatively. Correlations between pachymetry,epithelial thickness changes and the amount of correction,were analyzed.Compared to preoperative values,the central 2 mm and the paracentral 2 to 5 mm zone epithelium was 1 ± 2.85 and 1 ± 3.11 μm thicker,respectively,at 3 months postoperatively (P <.05). The spherical equivalent (SE) changed from-2.80 ± 2.028 diopters (D) preoperatively to -0.40 ± 0.42 D at 3 months postoperatively. Females show greater postoperative epithelial thickening, 2.6 ± 3.77 μm,than males,0.34 ± 1.98 μm. There was a trend toward greater epithelial thickening with a larger amount of programmed SE correction, and thinner preoperative epithelium. No correlation between epithelial thickness change and postoperative change in refraction was detected.Negative correlation between between age, refractive error,with the pre and post-operative pachymetry. In general female pachymetry reading is higher than it in male.The corneal epithelial thickness increased after PRK up to 3 months postoperatively. It was affected by the amount of myopia treated, gender, and preoperative epithelial thickness. The refractive outcomes did not affected by the postoperative epithelial thickening. Negative correlation between between age, refractive error, with the pre and post-operative pachymetry. In general female pachymetry reading is higher than it in male.

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Corneal Epithelial Thickness Intrasubject Repeatability and its Relation With Visual Limitation in Keratoconus

American Journal of Ophthalmology ◽

10.1016/j.ajo.2019.01.015 ◽

2019 ◽

Vol 200 ◽

pp. 255-262 ◽

Cited By ~ 10

Author(s):

Alfredo Vega-Estrada ◽

Michael Mimouni ◽

Elias Espla ◽

Jorge Alió del Barrio ◽

Jorge L. Alio

Keyword(s):

Corneal Epithelial ◽

Epithelial Thickness ◽

Corneal Epithelial Thickness

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Reliability and Reproducibility of Assessment of Corneal Epithelial Thickness by Fourier Domain Optical Coherence Tomography

Investigative Opthalmology & Visual Science ◽

10.1167/iovs.11-8981 ◽

2012 ◽

Vol 53 (6) ◽

pp. 2580 ◽

Cited By ~ 34

Author(s):

Gaurav Prakash ◽

Amar Agarwal ◽

Anjum Iqbal Mazhari ◽

Mathangi Chari ◽

Dhivya Ashok Kumar ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Fourier Domain ◽

Optical Coherence ◽

Corneal Epithelial ◽

Epithelial Thickness ◽

Corneal Epithelial Thickness

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Diurnal Variation of Corneal and Corneal Epithelial Thickness Measured Using Optical Coherence Tomography

Cornea ◽

10.1097/00003226-200107000-00008 ◽

2001 ◽

Vol 20 (5) ◽

pp. 480-483 ◽

Cited By ~ 110

Author(s):

Yunwei Feng ◽

Jalazah Varikooty ◽

Trefford L. Simpson

Keyword(s):

Optical Coherence Tomography ◽

Diurnal Variation ◽

Optical Coherence ◽

Corneal Epithelial ◽

Epithelial Thickness ◽

Corneal Epithelial Thickness

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Evaluation of Corneal Epithelial Thickness Imaged by High Definition Optical Coherence Tomography in Healthy Eyes

Cornea ◽

10.1097/ico.0000000000001745 ◽

2019 ◽

Vol 38 (1) ◽

pp. 62-66 ◽

Cited By ~ 3

Author(s):

Elmira Baghdasaryan ◽

Tudor C. Tepelus ◽

Kenneth M. Marion ◽

Homayoun Bagherinia ◽

SriniVas R. Sadda ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Optical Coherence ◽

High Definition ◽

Corneal Epithelial ◽

Epithelial Thickness ◽

Corneal Epithelial Thickness ◽

Healthy Eyes

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Effects of electronic cigarettes and hookah (waterpipe) use on home air quality

Tobacco Control ◽

10.1136/tobaccocontrol-2020-056437 ◽

2021 ◽

pp. tobaccocontrol-2020-056437

Author(s):

Jenni A Shearston ◽

James Eazor ◽

Lily Lee ◽

M J Ruzmyn Vilcassim ◽

Taylor A Reed ◽

...

Keyword(s):

New York ◽

New York City ◽

Air Quality ◽

Electronic Cigarettes ◽

Cigarette Use ◽

Major Site ◽

Passive Exposure ◽

Household Members ◽

The Impact ◽

Waterpipe Use

IntroductionA major site of secondhand smoke exposure for children and adults is the home. Few studies have evaluated the impact of e-cigarette or hookah use on home air quality, despite evidence finding toxic chemicals in secondhand e-cigarette aerosols and hookah smoke. We assessed the effect of e-cigarette and hookah use on home air quality and compared it with air quality in homes where cigarettes were smoked and where no smoking or e-cigarette use occurred.MethodsNon-smoking homes and homes where e-cigarettes, hookah or cigarettes were used were recruited in the New York City area (n=57) from 2015 to 2019. Particulate matter with diameter less than 2.5 µm (PM2.5), black carbon and carbon monoxide (CO) were measured during a smoking or vaping session, both in a ‘primary’ smoking room and in an adjacent ‘secondary’ room where no smoking or vaping occurred. Log transformed data were compared with postanalysis of variance Tukey simultaneous tests.ResultsUse of hookah significantly increased PM2.5 levels compared with non-smoking homes, in both the primary and secondary rooms, while use of e-cigarettes increased PM2.5 levels only in primary rooms. Additionally, in-home use of hookah resulted in greater CO concentrations than the use of cigarettes in primary rooms.ConclusionsUse of e-cigarettes or hookah increases air pollution in homes. For hookah, increases in PM2.5 penetrated even into rooms adjacent to where smoking occurs. Extending smoke-free rules inside homes to include e-cigarette and hookah products is needed to protect household members and visitors from passive exposure to harmful aerosols and gases.

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