This study is aimed to investigate the impact of computer-mediated technology on the reading proficiency skills of ESL learners' at the secondary level in Pakistan. In this research, a newly developed software Immersive reader has been used to treat ESL learners to minimize and meet their reading deficiencies. Two groups of students were managed, ie, the controlled group and experimental group. The Control group was taught through the traditional teaching method, and the experimental group was treated through CMI (Computer-Mediated Technology). A pre-test was conducted to assess ESL learners' present knowledge of reading skills from both the groups, and their obtained score was noted. Similarly, after treatment, a post-test of both the groups was conducted, and ESL learners obtained score was noted. It was noticed that the experimental group achieved a significantly good score as compared to the control group's ESL learners. Their reading skills improved amazingly.