All the papers I could find on this issue say that 4°C or 39°F is best.
If your refrigerator is not cold enough, putting the drops in a cup full of ice water will help get the drops to the right temperature.
Here are some References.
If your refrigerator is not cold enough, putting the drops in a cup full of ice water will help get the drops to the right temperature.
Here are some References.
Patients were asked to keep the bottles refrigerated at about 4 °C.
Preparation of autologous serum eye drop
A whole blood (20 mL) was taken from peripheral vein with vacutainer and allowed to clot at room temperature for 1 h. The blood was then centrifuged at 3000g for 10 min. Autologous serum was carefully prepared under laminar airflow cabinet, and diluted with 1:2 with artificial tear (Refresh tears®) in a sterile bottle. Patients were asked to keep the bottles refrigerated at about 4 °C.