J Korean Ophthalmol Soc.  2011 Apr;52(4):407-413.

Induced Astigmatism and High-Order Aberrations after 1.8-mm, 2.2-mm and 3.0-mm Coaxial Phacoemulsification Incisions

• Moon SJ
• Lee DJ
• Lee KH

Abstract

PURPOSE
To study theeffect of micro incision (1.8 mm) and small incision (2.2 mm and 2.8 mm) coaxial phacoemulsification on surgically induced astigmatism (SIA) and high-order aberrations (HOA) of anterior and posterior corneal surface.
METHODS
The present randomized clinical study included 32 eyes having a 1.8-mm, 38 eyes having a 2.2-mm, and 30 eyes having a 2.8-mm corneal incision. SIAs were measured at 1 and 3 months postoperatively. HOAs included coma, trefoil, and spherical aberration. The coma-root mean square (RMS) and trefoil-RMS were evaluated at 1 month after the cataract operation.
RESULTS
Surgically induced astigmatisms were 0.41 +/- 0.30 diopter (D) in the 1.8-mm incision group, 0.47 +/- 0.21 D in 2.2-mm group and 0.71 +/- 0.50 D in the 2.8-mm group. The SIA of the 1.8-mm group was smaller than the other groups (p = 0.002). There was no statistically significant difference in coma, spherical aberration of the corneal anterior surface and trefoil, or spherical aberration of the posterior surface among the 3 groups at 1 month after surgery.
CONCLUSIONS
Incision size contributes to postoperative corneal astigmatism. Phacoemulsification cataract surgery with less than 2.8-mm incision does not significantly influence the corneal aberrationsof anterior and posterior corneal surfaces.

Keyword

Coaxial microincisional cataract surgery; High-order aberration; Surgically induced astigmatism

MeSH Terms

Astigmatism
Cataract
Coma
Eye
Lotus
Phacoemulsification

Figure

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  Figure 1. Inter-group comparison of surgically induced astigmatism (SIA) at 1 and 3 months after cataract surgery. SIA is statistically different among 1.8-mm, 2.2-mm and 2.8-mm incision group at 1 and 3 months respectively.

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  Figure 2. Mean changes (μ m) in high order aberrations and root mean square of anterior corneal surface betweenbaseline and 1 month after operation. Only Z (3, -3) is different in statistical comparison among 3 groups. *p<0.05; † root mean square.

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  Figure 3. Mean changes (μ m) in high order aberrations and root mean square of posterior corneal surface betweenbaseline and 1 month after operation. Only Z (3, -1) is different in statistical comparison among 3 groups. *p<0.05; † root mean square.

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