Ophthalmic viscosurgical devices (OVDs), mainly containing sodium hyaluronate (HA), are used in cataract surgeries to protect the cornea endothelium. In this study, the rheological properties of 9 launched products (containing 1％ HA) were evaluated. The molecular weights (MWs) of HA estimated based on intrinsic viscosity varied widely, between 1100 2500 kDa, and showed a particular value for each product. Of the 9 products, 6 are classiˆed as cohesive OVDs and their product speciˆcations show the same value for intrinsic viscosity (25 45 dL/g), with high MW HA (＞ 2000 kDa); however, the MW of each HA showed a particular value (2200 2500 kDa) within the range of the product speciˆcation. As with the MW of HA, apparent viscosity and dynamic rheological parameters showed particular values for each OVD. The product Opegan-Hi exhibited the highest value of apparent viscosity at low shear rate, and a solid-like behavior among the OVDs. In a questionnaire survey among 198 cataract surgeons, 42％ of surgeons had experienced a diŠerence in ability to maintain the depth of anterior chamber during surgery among the diŠerent cohesive OVDs used. This suggested that surgeons select OVD properties based on surgical procedure and patient cases. In conclusion, we demonstrated that each OVD has particular rheological properties within the range of the product speciˆcation deˆned by the intrinsic viscosity. The results might provide useful information for surgeons in their selection of OVDs based on their experience.