Abstract: Since the 21st century, the development of corneal tissue engineering technology has been developing rapidly. With the progress of biomaterials, cell culture and tissue engineering technology, tissue engineering cornea has gained great development in both basic scientific research and clinical application. In particular, tissue engineered corneal scaffolds are the core components of tissue engineered corneas. It is the focus of current research on tissue engineering cornea to search for scaffolds with good biocompatibility, high safety and good biomechanical properties. In this paper, the recent research progress of tissue engineering corneal materials is reviewed.

Objective: To evaluate the effectiveness of intravitreal injection of various doses of conbercept in the treatment of retinopathy of prematurity (ROP) and change of intraocular pressure (IOP) after operation. Methods: It was a prospective randomized controlled study. Children who were diagnosed with pre-threshold ROP, threshold phrase ROP, and aggressive ROP (A-ROP) in Xiamen Maternity and Child Healthcare Hospital from January 1, 2018 to June 30, 2021 were included in the study. The children were randomly divided into a reduction group and a constant group, and received intravitreal injection of10 mg/mL conbercept at 0.015 mL (containing 0.15 mg of conbercept) and 0.025 mL (containing 0.25 mg of conbercept) respectively. IOP was measured and recorded 5 min before injection, 5 min, 30 min, 1 h, 12 h and 24 h after injection. The fundus condition was followed up 1 week after the operation. The efficacy evaluation is divided into one cure, recurrence and exacerbation. Results: A total of 98 eyes of 49 cases were included in thestudy. For 27 cases of 54 eyes in the constant group, the one-time cure success rate was 79.6% (43/54), the recurrence rate was 16.7% (9/54), and the exacerbation rate was 3.7% (2/54). In the reduction group, there were 22 cases (44 eyes). The one-time cure success rate was 68.2% (30/44), the recurrence rate was 27.3% (12/44), and the exacerbation rate was 4.5% (2/44). There was no significant difference between the two groups (χ2=1.672,P=0.196). There was no significant difference in IOP between the 2 groups 5 min before treatment (P=0.494). There were statistically significantdifferences in IOP between the 2 groups at 5 min after injection, 1 h after injection, and 12 h after injection (all P<0.05). There was no difference in IOP between the two groups 24 h after injection (P=0.101). There was a statistically significant difference in IOP between 5 min before and 24 h after injection in the constant group (P=0.03), and there was no significant difference in IOP between 5 min before and 24 h after injection in the reduction group (P=0.84). Conclusion: Reduced dose of conbercept (0.15 mg) is effective in the treatment of ROP, and the efficacy is similar to that of conventional dose (0.25 mg). The reduction can help lower the increase of postoperative IOP, returning to the preoperative level more rapidly and safely.