Table 2

Scoring criteria of circular capsulorhexis in porcine eye

Capsulorhexis circularity R=minimum rhexis diameter/maximum rhexis diameter
2 points0.85<R≤1.01 point0.7<R≤0.850 pointR≤0.7
Capsulorhexis size S= (minimum rhexis diameter +maximum rhexis diameter)/2 (mm)
2 points5.5≤R≤6.51 point6.5<R≤7.5 or 4.5≤R<5.50 pointR>7.5 or R<4.5
Capsulorhexis centring C=maximum distance from the centre of rhexis to the centre of pupil (mm)
2 pointsC≤0.51 point0.5<C≤10 pointC>1
Tissue protection
2 points: Any or combination of the following mistakes: Clear cornea tunnel: no or very little incision stress; Cornea: ≤1 slight localised endothelial contact; Lens: No or slight superficial churning of lens fibre
1 point: Any or ≤2 of the following mistakes: Clear cornea tunnel: marked incision stress (no viscoelastics refill needed); Cornea: ≤1 strong localised or ≤2 slight localised endothelial contact; Lens: ≤2 churning of deep lens fibre, lens displacement
0 point: mistakes severe than 1 point
Time T=first attempt to enter the anterior chamber until completion of capsulorhexis (min)
2 pointsT≤51 point5<T≤100 pointT>10