Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Nov 1;17:164. doi: 10.1186/s12938-018-0597-y

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

PMC Copyright notice

Fig. 3 — Representative OCT intensity profiles for the measurement of the tear film thickness. a A-scan of the precorneal tear film (PCTF). α, the anterior surface of the PCTF; β, the posterior surface of the PCTF; γ, the posterior surface of the cornea. b A-scan of the prelens tear film (PLTF). α, the anterior surface of the PLTF; β, the posterior surface of the PLTF or the anterior surface of the contact lens; γ, the posterior surface of the contact lens; ε, the posterior surface of the cornea. The thickness of tear film layer is calculated by determining the distance between peaks α and β