{"id":51092,"date":"2021-03-18T13:34:45","date_gmt":"2021-03-18T17:34:45","guid":{"rendered":"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/?p=68"},"modified":"2022-04-13T10:38:18","modified_gmt":"2022-04-13T14:38:18","slug":"eyez","status":"publish","type":"post","link":"https:\/\/www.hajim.rochester.edu\/senior-design-day\/eyez\/","title":{"rendered":"EYEZ"},"content":{"rendered":"\n<h2 class=\"has-custom-font wp-block-heading\" style=\"font-family:Heebo\">TEAM MEMBERS<\/h2>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/wp-content\/uploads\/2021\/03\/DSC_5066-1-1024x927.jpg\" alt=\"\" data-id=\"136\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/03\/DSC_5066-1-scaled-1.jpg\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/dsc_5066-1\/\" class=\"wp-image-136\"\/><figcaption class=\"blocks-gallery-item__caption\">Alyssa Ho, Project Coordinator<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/03\/1570020014234.jpg\" alt=\"\" data-id=\"140\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/03\/1570020014234.jpg\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/1570020014234\/\" class=\"wp-image-140\"\/><figcaption class=\"blocks-gallery-item__caption\">Andres Garcia Coleto, Customer Liaison<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/03\/163820514_860208761224794_1201360179424894804_n-1024x1024.jpg\" alt=\"\" data-id=\"134\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/03\/163820514_860208761224794_1201360179424894804_n.jpg\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/163820514_860208761224794_1201360179424894804_n\/\" class=\"wp-image-134\"\/><figcaption class=\"blocks-gallery-item__caption\">Christopher Pressimone, Scribe and Document Handler<\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">CUSTOMER &amp; FACULTY ADVISOR<\/h3>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Brandon-1.png\" alt=\"\" data-id=\"463\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Brandon-1.png\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/brandon-1\/\" class=\"wp-image-463\"\/><figcaption class=\"blocks-gallery-item__caption\">Dr. Brandon Zimmerman, Digiteyez Corporation<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Ali-1.png\" alt=\"\" data-id=\"465\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Ali-1.png\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/ali-1\/\" class=\"wp-image-465\"\/><figcaption class=\"blocks-gallery-item__caption\">Ali Hashim, Digiteyez Corporation<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/TBrown-1.png\" alt=\"\" data-id=\"469\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/TBrown-1.png\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/tbrown-1\/\" class=\"wp-image-469\"\/><figcaption class=\"blocks-gallery-item__caption\">Prof. Thomas Brown, Institute of Optics<\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<h2 class=\"has-custom-font wp-block-heading\" style=\"font-family:Heebo\">DESCRIPTION<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">FITNESS FOR USE<\/h3>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Typical eye exams are inconvenient to patients for many reasons, including scheduling fatigue, subjective inaccuracies from guessing whether something they see is better or worse, and the optometrists determining prescriptions partially based on patients\u2019 personality and mood. Digiteyez Technologies has developed an algorithm that models a patient\u2019s eye, simulates their vision, and calculates the ideal 20\/20 prescription, effectively creating the world\u2019s first digital eye exam.<\/p>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Our project aims to modify Digiteyez Technologies\u2019 pre-existing algorithms to calculate the axis of astigmatism, model the presbyopic eye, and determine whether the patient is myopic or hyperopic without a previously known prescription based on physical characteristics of the patient, such as age and sex. The final product will give a prescription for refractive errors that can be addressed with corrective lenses given only the physical characteristics and visual acuity of the patient.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DESIGN<\/h3>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Our algorithms use the Gullstrand model as a foundation for the eye and expands upon it to account for presbyopia. We modified the power of the eye in this model to account for presbyopia in older patients.<\/p>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">The Gullstrand model of the eye is a six surface eye model with two surfaces in the crystalline lens which contains a high index core and a lower index shell. Due to spherical aberration, the model will not perfectly match clinical data despite it being correct on the paraxial level. <\/p>\n\n\n\n<p class=\"has-text-align-left has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Using real patient data for SPH, CYL, and axis of astigmatism, we explored visual acuity equations can be used to optimize Digiteyez\u2019 existing algorithm such that analytical expressions for axis of astigmatism can be determined. This has been done by introducing unique error functions that explore the sensitivity of the theoretical visual acuity curve against clinical prescriptions, particularly the spherical equivalent. By equating the spherical equivalent power of a patient\u2019s assigned prescription to the angular representation of blur area, our merit functions can not only be constrained to uniquely solve for an analytical expression of the axis of astigmatism, but also to define how sensitive visual acuity is to axis power of a prescription. In parallel, we used the Classification Learner app in MATLAB to search for unseen trends in patient data and determine whether the theoretical equation for V matches well with patient data.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TESTING<\/h3>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Our MATLAB model uses a datasheet with 160 nearsighted patients to calculate their axis of astigmatism based on their SPH and CYL values. Our decision trees determine whether a patient has with-the-rule (WTR) or (ATR) axes of astigmatism with a 78% accuracy.<\/p>\n\n\n\n<figure class=\"wp-block-gallery aligncenter columns-2 is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/DecisionTree.png\" alt=\"\" data-id=\"354\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/decisiontree\/\" class=\"wp-image-354\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/DataCluster.jpg\" alt=\"\" data-id=\"356\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/datacluster-2\/\" class=\"wp-image-356\"\/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"><em>Figure 1: a) Decision tree model<\/em>; <em>b)The dataset shows three main clusters of data, between 0-60 deg, 61-120 deg, and 121-180 degs<\/em>; c) <em>&nbsp;In red, the ATR patients, in blue, the WTR patients. As expected, the refractive error \u2018ellipse\u2019 ratio will separate the data into WTR and ATR patients. This train of thought is used with other optic of the eye values to further separate the patients into smaller axes bins, instead of just WTR and ATR.<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Knowing that the axes of astigmatism prescriptions are clumped in WTR and ATR clusters, we used decision trees that predicted if a patient should have a prescription of WTR or ATR astigmatism. The decision trees used optical values that can be calculated from SPH and CYL to achieve better accuracy. For instance, the following figure shows the ratio between X and Y axes refractive error for a patient vs CYL.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><thead><tr><th><strong>Feature Selection Combination<\/strong><\/th><th><strong>Highest Accuracy<\/strong><\/th><th><strong>Most Accurate Tree(s)<\/strong><\/th><\/tr><\/thead><tbody><tr><td>SPH and CYL<\/td><td>74.00%<\/td><td>Coarse Tree<\/td><\/tr><tr><td>SPH equivalent and CYL<\/td><td>73.20%<\/td><td>Coarse KNN<\/td><\/tr><tr><td>Visual Acuity<\/td><td>78.00%<\/td><td>Coarse KNN<\/td><\/tr><tr><td>Calculated Visual Acuity<\/td><td>77.20%<\/td><td>Coarse KNN<\/td><\/tr><tr><td>Visual Acuity, Visual Acuity Contrast<\/td><td>74.00%<\/td><td>Fine Tree, Medium Tree<\/td><\/tr><tr><td>SPH Equivalent and Visual Acuity<\/td><td>78.00%<\/td><td>Coarse KNN<\/td><\/tr><tr><td>Age<\/td><td>77.20%<\/td><td>Coarse Tree<\/td><\/tr><\/tbody><\/table><figcaption><em>Table 1: The combination of predictors, the highest possible accuracy of a decision tree trained to the given combination, and the most accurate decision tree.<\/em><\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-4 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Class1.png\" alt=\"\" data-id=\"472\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/class1\/\" class=\"wp-image-472\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Predictor1.png\" alt=\"\" data-id=\"471\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/predictor1\/\" class=\"wp-image-471\"\/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"><em>Figure 2: a) Division and explanation of WTR vs ATR axes;&nbsp; b) Estimation of predictor importance when training decision tree. Note that blur size and relative visual acuity are the most important predictors, followed by age and SPH prescription value.<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">The highest accuracy we achieved with any decision tree classifying axes between WTR or ATR was 82%. It is important to understand that this decision tree achieves such high accuracy because patients with axis between 0-60 degrees fall under the same category as patients with axis between 120-180 degrees.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<figure class=\"wp-block-gallery aligncenter columns-2 is-cropped wp-block-gallery-5 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Class2.png\" alt=\"\" data-id=\"474\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Class2.png\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/class2\/\" class=\"wp-image-474\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Tree2.png\" alt=\"\" data-id=\"473\" data-full-url=\"https:\/\/www.hajim.rochester.edu\/senior-design-day\/wp-content\/uploads\/2021\/04\/Tree2.png\" data-link=\"https:\/\/seniordesign.digitalscholar.rochester.edu\/optics2021\/senior-design\/eyez\/attachment\/tree2\/\" class=\"wp-image-473\"\/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"><em>Figure 3: a) Classes in which patients are divided;&nbsp; b) One of the possible trained decision trees with an accuracy of 53%.<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">After optimizing the decision tree, we were able to obtain 58% accuracy. This tree was very good at determining when a patient is class 2 (between 60 and 120 degrees), but struggled to differentiate class 1 from 3 (0-60 degrees, and 120-180 degrees).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">CONCLUSIONS<\/h3>\n\n\n\n<p class=\"has-custom-font has-custom-lineheight has-custom-letterspacing\" style=\"font-family:Helvetica;line-height:1.75;letter-spacing:0.5px;font-size:18px\">Based on our testing, we can conclude that our assumptions over the course of the project were correct. Although we did not have enough data points to fully define the presbyopic eye, we developed a classification learner model that the customer will train with more data points to make significant insights and improve the accuracy of their algorithms<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Development of a telehealth platform that provides digital optical prescriptions, making high quality vision accessible to everyone.<\/p>\n","protected":false},"author":6242,"featured_media":49812,"comment_status":"open","ping_status":"open","sticky":false,"template":"templates\/template-full-width.php","format":"standard","meta":{"_coblocks_attr":"YrsaHeebo,Open Sans,PT Serif,Yrsa,Oswald,,Arvo,Anton,Heebo,Barlow,Georgia,Helvetica","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[3006,136,2976,8792],"tags":[],"coauthors":[8612],"class_list":["post-51092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-machine-learning-archive","category-opt-ope-archive","category-optical-archive","category-vision-archive"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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