Posters

Changes in shape and astigmatism of total and posterior cornea after long vs short clear corneal incision cataract surgery

Poster Details

First Author: K.Hayashi JAPAN

Co Author(s):    M. Yoshida   A. Hirata   K. Yoshimura              

Abstract Details

Purpose:

To compare changes in shape and astigmatism of the total and posterior cornea between eyes with long-length clear corneal incisions (CCIs) and eyes with short-length CCIs in cataract surgery.

Setting:

Hayashi Eye Hospital, Fukuoka, Japan.

Methods:

Both eyes of 120 patients undergoing phacoemulsification with temporal CCIs were randomized to undergo long-length (≥1.75 mm) or short-length (<1.75 mm) CCI. Corneal astigmatic changes were decomposed to vertical/horizontal (J0) and oblique changes (J45) using power vector analysis, and corneal shape changes were assessed using the average of difference map on videokeratography at 2 days, and 2, 4, and 8 weeks postoperatively.

Results:

The mean J0 and J45 of the total cornea were significantly greater in the long CCI group than in the short CCI group at all follow-up periods (P≤. 0290). The videokeratography showed a wedge-shaped flattening in the total cornea and a steepening in the posterior cornea around the CCI at 2days postoperatively in both groups. This wound-related flattening of the total cornea rapidly reduced but persisted until 8 weeks, while the steepening of the posterior cornea disappeared within 4 weeks. These changes extended closer to the central cornea in the long CCI group than in the short CCI group.

Conclusions:

Corneal astigmatic changes were significantly greater after long CCI than after short CCI. The wound-related shape changes occurred immediately postoperatively, but rapidly diminished; these changes extended closer to the central cornea after long CCI than after short CCI.

Financial Disclosure:

None