Scoring criteria of cornea suturing in porcine eye
| Length of suture placement on each side L=average length of three sutures (mm) | |||||
| One point | 0.75≤L≤1.25 | 0.5 point | 1.25<L≤1.5 or 0.5≤L<1.25 | 0 point | L>1.5 or L<0.5 |
| Uniformity of suture placement length UL=maximum length – minimum length (mm) | |||||
| One point | UL≤0.25 | 0.5 point | 0.25<UL≤0.5 | 0 point | UL>0.5 |
| Spacing of suture placement S=average spacing of three sutures (mm) | |||||
| 1 point | 1.0≤S≤1.5 | 0.5 point | 1.5<S≤1.75 or 0.75≤S<1.0 | 0 point | S>1.75 or S<1.0 |
| Uniformity of suture placement spacing US = maximum spacing – minimum spacing (mm) | |||||
| 1 point | US≤0.25 | 0.5 point | 0.25<US≤0.5 | 0 point | US>0.5 |
| Depth of suture placement D = average (depth of suture placement/cornea thickness) | |||||
| 1 point | 0.67≤D≤0.8 | 0.5 point | 0.5<D≤0.67 or 0.8≤D<0.9 | 0 point | D>0.9 or D<0.5 |
| Uniformity of suture placement depth UD = (maximum depth – minimum depth)/cornea thickness | |||||
| 1 point | UD ≤0.1 | 0.5 point | 0.1<UD≤0.15 | 0 point | UD >0.15 |
| Tissue protection | |||||
| 2 points: Any or combination of the following mistakes: no or very little incision stress; ≤1 slight corneal stroma damage | |||||
| 1 point: Any or combination of the following mistakes: ≥1 marked incision stress (no viscoelastics refill needed); ≤1 severe corneal stroma damage or ≤2 slight corneal stroma damage | |||||
| 0 point: mistakes severe than 1 point | |||||
| Time T=first attempt to enter the anterior chamber until completion of suturing (min) | |||||
| Two points | T≤15 | one point | 15<T≤20 | 0 point | T>20 |