Surgically induced changes in astigmatism and shape of total and posterior cornea after nasal versus temporal clear corneal incision (CCI) cataract surgery: a prospective randomized clinical study

INTERVENTION: One hundred left eyes of 100 patients with with‐the‐rule astigmatism of 0.5 D or less were randomly assigned to one of the two groups. 50 eyes were to undergo nasal CCI and 50 eyes were to undergo temporal CCI. CONDITION: Cataract PRIMARY OUTCOME: Patients are to undergo examinations at 2 days and at 2, 4, and 8 weeks after surgery.; 1) Corneal astigmatism of anterior and posterior corneas (simulated K value of a videokeratography system; Tomey TMS‐5); 2) Corneal shape changes of anterior and posterior cornea (average of difference map of TMS‐5) SECONDARY OUTCOME: 3) Irregular astigmatism components (asymmetry and higher‐order irregularity components); 4) Ocular higher order aberrations (HOAs); 5) Visual acuity and refractive status; 6) Wound length and width; 7) Pupil diameter; 8) Surgical factors INCLUSION CRITERIA: One hundred left eyes of 100 patients with with‐the‐rule astigmatism of 0.5 D or less.