Data Collection: Demographic and relevant clinical characteristics of all included patients will be collected on structured proforma. ICU prognostication scores, i.e., Acute Physiologic and Chronic Health Evaluation (APACHE) II score and Sequential Organ Dysfunction Assessment (SOFA) will also be recorded. Duration of prone ventilation as well as position of head (right or left side turn) will also be noted down. IOP will be measured for both eyes at pre-defined time intervals. Detailed ophthalmic examination findings will be collected among survivors at time of ICU discharge and after 3 months in follow up.