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This study goals to: (1) Produce learning media based on virtual lab applications that is worth for use in class XI learning on the subject of optics, (2) find out how much increase of visual science literacy of grade XI students in Class on the subject of optics by using virtual lab application with a discovery learning approach, and (3) find out how much increase of conceptual understanding of grade XI student in class on the subject of optics by using virtual lab application with a discovery learning. This research is development research with a 4D model design consisting of define, design, develop and disseminate. The subject of this study was students of grade XI science class on second semester Public Senior High School 1 Godean in Academic Year 2020/2021. Define step to perform needs analysis such as analyzing the condition of the school environment, students, curriculum, and learning objectives. The design step of the researchers made a product design of virtual learning media lab optical tools and research instruments. The development step is carried out validation of research products and instruments until conducting limited trials. Disseminate step, researchers disseminate products that have been made through the website. The results obtained indicate that: 1) learning media in the form of virtual optical lab tools with a discovery learning approach using 3D Unity are feasible, 2) virtual lab optical tools media can improve the scientific literacy of high school students in class XI with moderate categories, and 3) virtual optical instrument practicum media can improve students' conceptual understanding on optical instrument material, sub-materials of reflection and refraction with high categories. [ABSTRACT FROM AUTHOR]