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. 2024 May 6;4(5):100546.
doi: 10.1016/j.xops.2024.100546. eCollection 2024 Sep-Oct.

Next-Generation Tear Meniscus Height Detecting and Measuring Smartphone-Based Deep Learning Algorithm Leads in Dry Eye Management

Affiliations

Next-Generation Tear Meniscus Height Detecting and Measuring Smartphone-Based Deep Learning Algorithm Leads in Dry Eye Management

Farhad Nejat et al. Ophthalmol Sci. .

Abstract

Purpose: This study aims to develop and assess an infrastructure using Python-based deep learning code for future diagnostic and management purposes related to dry eye disease (DED) utilizing smartphone images.

Design: Cross-sectional study using data which was gathered in Vision Health Research Clinic.

Participants: One thousand twenty-one eye images from 734 patients were included in this article that categorizes into 70% females and 30% males, with no sex and age limit.

Methods: One specialist captured eye images using Samsung A71 (601 images) and iPhone 11 (420 images) cell phones with the flashlight on and direct gaze to the camera. These images include the area of only 1 eye (left/right).

Main outcome measures: First, our specialist did 3 different segmentations for every eye image separately for 80% of the training data. This part contains eye, lower eyelid, and iris segmentation. In 20% of test data after automated cropping of the lower eyelid margin and upscaling by 8×, the appropriate tear meniscus height segmentation will be chosen and measured using a deep learning algorithm.

Results: The model was trained on 80% of the data and 20% of the data used for validation from both phones with different resolutions. The dice coefficient of the trained model for validation data is 98.68%, and the accuracy of the overall model is 95.39%.

Conclusions: It appears that this algorithm holds the potential to herald an evolution in the future of diagnosis and management of DED by homecare devices solely through smartphones.

Financial disclosures: The author(s) have no proprietary or commercial interest in any materials discussed in this article.

Keywords: Artificial intelligence; Deep learning; Dry eye disease; Smartphone; Tear meniscus height (TMH).

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Figures

Figure 1
Figure 1
Sample eye images and masks. A, Images from Samsung A71. B, Images from iPhone11.
Figure 2
Figure 2
Sample cropped eye images and masks for lower eyelid detection. A, Images from Samsung A71. B, Images from iPhone11.
Figure 3
Figure 3
Pipeline of our method. A, Predict the mask of the input eye image using the eye segmentation model. B, Crop image according to the mask to have the area around the lower eyelid and below the iris, upscale the cropped image by 8× and enhance the quality of the cropped image, and give it to the cropped eye segmentation model to accurately detect the lower eyelid. The final mask to use in stage (C) is the combination of the output masks in stages (A) and (B). C, Find the desired reflection that is on or above the eyelid and the nearest one to the interception point of the vertical line (passing through the center of the reflection in the pupil) and the lower eyelid (the desired reflection is the one surrounded by green), and then calculate the TMH in millimeters using equation (6), and the iris diameter (calculated from the mask). TMH = tear meniscus height.
Figure 4
Figure 4
Architecture of the eye segmentation model. The input image is the image of 1 eye and the output is the mask that segments the iris, sclera, and background. BN = batch normalization; conv = convolution; ReLU = rectified linear unit.
Figure 5
Figure 5
Confusion matrix of eye segmentation model.
Figure 6
Figure 6
Confusion matrix of the eyelid detection model.
Figure 7
Figure 7
Sample results of the overall model. A, Wrong iris diameter and thus wrong TMH value. B, Wrong eyelid detection which results in wrong reflection selection. C, Wrong reflection selection among multiple reflections. D, Correct result. TMH = tear meniscus height.

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