In quantitative data analysis, frequency, percentage, and average, independent sample t-test, and one-way ANOVA were applied as well as descriptive statistics. The data were collected through the Online Examination Assessment Scale and an interview form developed by researcher. The study sample consisted of 69 teacher candidates enrolled in 3 different courses lectured by the researcher at the Computer Education and Instructional Technologies Department, in the spring semester of 2019-2020 academic year. This research is a descriptive study with explanatory sequential mixed method design. This study aims to determine the attitudes and opinions of pre-service IT teacher candidates regarding online testing at the first period of the COVID-19 pandemic. This area of study needs empirical research to ascertain other health hazards associated with the new technology evolving in our daily activities. About 58% of the vision experts believe blue light filters will reduce visual degradation when over exposed to digital screens. Vision care experts confirmed treating many young adult patients with vision-related issues in the past five years compared with a decade ago. About 73% of these student respondents affirmed using a smartphone as the primary digital screen device for 5-6 hours daily, and 37% confirmed to have experienced eye dryness and irritation during COVID-19. Results revealed that about 59% of the students experienced a worse vision from 2015 to late 2021. One hundred and two students and twelve vision care experts participated in the study. This study investigated the connection between the rapid availability of digital screen devices and vision problems in young adults. Most of the consumer products used in this current age have a screen interface and are abundantly distributed to the public. Technology in the modern age is used in various sectors, particularly screen technology, usually in many everyday devices such as smartphones, personal computers, tablets, and smartwatches.