A three-member expert team will now investigate the matter to check the affected patients' condition.
At least 32 people were left blinded after being treated at an eye camp in Madhya Pradesh's Satna district.
The patients complained of loss of vision after being administered injections their retinas last month, prompting the local administration to order a probe into the incident.
The eye check-up camp was held on December 29 at a trust-run Sadguru Eye Hospital in the district during which the patients were administered an injection in their retinas.
Within hours, some of the patients started complaining that they were not able to see. They were reinjected and asked to wait for some time. But most say that it has been almost three weeks and their sight hasn't returned.
They were briefly admitted to hospital. But they were later discharged and told that the problem had occurred after the operation.
A three-member expert team will now investigate the matter to check the affected patients' condition and available facilities at the hospital, District Officer Santosh Mishra told IANS on Sunday.
The latest incident has come two months after 65 patients lost their sight after undergoing cataract operation in the state's Badwani district and five patients lost their vision in Sheopur district in a separate incident at a government hospital.