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. Author manuscript; available in PMC: 2021 Oct 1.
Published in final edited form as: Br J Ophthalmol. 2019 Dec 23;104(10):1394–1398. doi: 10.1136/bjophthalmol-2019-315446

Figure 1.

Figure 1.

Prototype smartphone tonometer and machine learning image processing. (A) Prototype schematic showing the clear applanator aligned with the smartphone camera (B) The prototype smartphone tonometer used in this study. Metal siding in conjunction with a blue filter redirects the smartphone flash to illuminate the applanator tip with blue light. (C) Example frame from a video showing a typical appearance for the applanation tip and applanation mire. (D) Machine-Learning segmentation of the applanation tip circle and the applanation mire circle.