PT  - JOURNAL ARTICLE
AU  - Ken Hayashi
AU  - Tatsuhiko Sato
AU  - Motoaki Yoshida
AU  - Koichi Yoshimura
TI  - Corneal shape changes of the total and posterior cornea after temporal versus nasal clear corneal incision cataract surgery
AID  - 10.1136/bjophthalmol-2017-311710
DP  - 2019 Feb 01
TA  - British Journal of Ophthalmology
PG  - 181--185
VI  - 103
IP  - 2
4099  - http://bjo.bmj.com/content/103/2/181.short
4100  - http://bjo.bmj.com/content/103/2/181.full
SO  - Br J Ophthalmol2019 Feb 01; 103
AB  - Aim To compare changes in the shape and astigmatism of the total and posterior cornea between eyes with a nasal clear corneal incision (CCI) and eyes with a temporal CCI in cataract surgery.Methods The left eyes of 100 patients undergoing phacoemulsification were randomly assigned to undergo a 2.4 mm nasal (nasal CCI group) or temporal CCI (temporal CCI group). Corneal astigmatic changes were compared between groups using power vector analysis, and corneal shape changes were compared using videokeratography maps at 2 days, and at 2, 4 and 8 weeks postoperatively.Results The mean J0 and J45 values of the total cornea were significantly greater in the nasal CCI group than in the temporal CCI group at 2 and 4 weeks postoperatively (p≤0.0392), but did not differ significantly between groups at 2 days and 8 weeks. The videokeratography maps revealed a wedge-shaped flattening in the total cornea and a steepening in the posterior cornea around the CCIs in both groups at 2 days postoperatively; those were more prominent in the nasal CCI group than in the temporal CCI group. The wound-related changes diminished by 8 weeks postoperatively in the total and posterior cornea, and were not markedly different between groups at 8 weeks postoperatively.Conclusion Corneal shape and astigmatic changes were comparable between groups at 8 weeks postoperatively, although the changes were greater after nasal CCI than after temporal CCI in the early postoperative periods, indicating that nasal or temporal CCI can be selected based on the surgeon’s preference.