The present study aimed to assess the prognosis of Terson's syndrome and the main relative factors of disease outcome in patients suffered from a subarachnoid hemorrhage (SAH). This prospective cohort study was performed on 87 consecutive patients (174 eyes) referred to Amiralmomenin hospital in Rasht, Iran, with the documented diagnosis of CT scanning-based SAH that had been followed-up for six months for assessing the prognosis. The overall prevalence of Terson's syndrome in our population was 13.2%. The comparison between the two groups with and without Terson's syndrome showed no significant difference in terms of gender and age. Correspondingly, an aneurysmal cause was revealed in 65.2% and 39.1% of those patients with and without Terson's syndrome, respectively (OR = 2.92, p = 0.018). Only 8.7% of the patients were diagnosed for vitrectomy surgery due to a dense vitreous hemorrhage at the end of the third month. Moreover, 24.1% of the patients with Terson's syndrome died. Unlikely, the rate of mortality was numerically higher than in those patients with SAH alone as compared to those patients who had both SAH and Terson's syndrome concurrently, but it was not statistically significant (25.2% versus 17.4%, p = 0.420). The mechanism of aneurysm (OR = 5.47, p = 0.009), higher Hunt-Hess grade (OR = 13.9, p < 0.001), and lower WFNS (OR = 0.040, p = 0.001) could effectively predict the occurrence of Terson's syndrome. Occurance of terson syndrome in SAH was accompanied with higher mortality, but the difference was not statistically significant.