視覺障礙(Visual impairement)在身心障礙的類別中，仍然是目前主要身障類型，隨著人口的高齡化，視覺障礙的族群數量會持續的攀升。為維繫生活所需，購物是視覺障礙者日常生活的重要部分，但是在目前的生活環境中，實體購物對視障者來說有許多困難和挑戰。
隨著科技的不斷進步，線上購物平台已成為現代生活中不可或缺的一部分，為消費者提供了方便、快捷的購物體驗。然而，視障者因視覺缺陷在使用上面臨許多挑戰，他們需要額外的支援與考量，其中包括他們在線上餐點外送平台上的使用性問題。尤其在餐點外送平台的服務中，使用者需要依賴視覺來閱讀菜單、選擇餐點以及完成訂單，這對於視障者來說可能是一個巨大的挑戰，因為現有的線上購物平台往往缺乏對於視障者友善的設計與功能。
本研究旨在探討視障者使用手機在線上餐點外送平台上的使用性問題，我們將透過實測五位重度視障者並使用放聲思考法瞭解現有在手機的外送平台在設計與功能上對於視障者的支援程度、視障者在使用中面臨哪些問題，而後將實測中放聲思考法的逐字稿編碼，和現有的無障礙網頁指南（WCAG）交叉比對，找出指南中未提及的指南建議。
經過實測和分析後，我們發現視障者在使用外送平台中主要面臨十個主問題，從視障者閱讀邏輯差異到與視障者文化本身皆有涵蓋，也附上十個主問題中的實際案例和子問題。最後我們將子問題與無障礙網頁指南WCAG交叉比對，整理出了八個WCAG2.1未完善提之處，也提出更完善的設計建議。

Visual impairment is still a major category of disability, particularly as the population ages, which will lead to an increase in the number of people with visual impairments. Shopping is an essential part of the daily life of visually impaired individuals, but physical shopping presents numerous difficulties and challenges in the current living environment.
With the continuous advancement of technology, online shopping platforms have become an indispensable part of modern life, providing consumers with convenient and fast shopping experiences. However, visually impaired individuals face many challenges due to their visual impairments when using these platforms, requiring additional support and considerations, especially regarding the usability of online food delivery platforms. In food delivery services, users need to rely on vision to read menus, select meals, and complete orders, which can be a significant challenge for visually impaired individuals, as existing online shopping platforms often lack designs and functions that are friendly to the visually impaired.
This study aims to explore the usability issues faced by visually impaired individuals when using mobile online food delivery platforms. We conducted usability tests with five severely visually impaired individuals and used the think-aloud method to understand the extent of support that current mobile delivery platforms provide for the visually impaired, the issues they face, and then encoded the verbatim transcripts from the think-aloud method during the usability tests, cross-referencing them with the existing Web Content Accessibility Guidelines (WCAG) to identify guideline suggestions that were not mentioned.After testing and analysis, we identified ten main issues faced by visually impaired individuals when using delivery platforms, covering everything from differences in reading logic to the cultural aspects of the visually impaired themselves. We also provided actual cases and sub-issues for each of the ten main issues. Finally, we cross-referenced the sub-issues with the WCAG 2.1 guidelines, identifying eight areas where WCAG 2.1 is not fully comprehensive, and we provided more refined design recommendations.

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