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Comparison of surgically induced astigmatisms after clear corneal incisions of different sizes.

Moon SC, Mohamed T, Fine IH - Korean J Ophthalmol (2007)

Bottom Line: This work was designed as a retrospective, comparative, nonrandomized interventional study.All procedures were performed with the temporal approach of self-sealing incisions.Keratometric data were obtained preoperatively, and 3 weeks, 3 months, 6 months, 9 months, 12 months, 24 months and 36 months postoperatively.

View Article: PubMed Central - PubMed

Affiliation: Oregon Eye Institute, Eugene, Oregon 97401, USA. sungcmoon@hanmail.net

ABSTRACT

Purpose: This study was performed to assess efficiency and stability of astigmatic change by incision size after cataract surgery.

Methods: This work was designed as a retrospective, comparative, nonrandomized interventional study. A total of 121 cases of cataract surgery were reviewed in 98 patients performed by one surgeon at the Oregon Eye Institute in Eugene, OR, USA with 3-year follow-ups. All procedures were performed with the temporal approach of self-sealing incisions. The serial change in surgically induced astigmatisms were examined in all cases of three groups: Group A, cartridge injection of a foldable IOL through a 2.5 mm self-sealing incision; Group B, cartridge injection of a foldable IOL through a 3.0 mm self-sealing incision; Group C, cartridge injection of a foldable IOL through a 3.5 mm self-sealing incision. Keratometric data were obtained preoperatively, and 3 weeks, 3 months, 6 months, 9 months, 12 months, 24 months and 36 months postoperatively. Polar value analysis was performed to calculate the surgically induced astigmatism.

Results: The astigmatic change decreased over time in Group B (P<0.05). The other groups tended to remain in induced astigmatism. All groups showed anticlockwise torque at 3 weeks following surgery. Group B showed a decrease in deviation, but the other groups showed increases in their torque value at postoperative 12 months (P<0.05).

Conclusions: The 3.0 mm incision size correlated with the least surgically induced astigmatism.

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Related in: MedlinePlus

SIA; individual values in Group C at 12 months.
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Figure 5: SIA; individual values in Group C at 12 months.

Mentions: Fig. 3, 4 and 5 show the individual pairs of polar values at 12 months. It is possible to perform a point-to-point retransformation to conventional notation. Net astigmatisms are symbols, and no calculation can be performed with these entities. For each pair of polar values, there are two solutions of net astigmatisms: one in the interval from 0° to 180° rotation around origio and one depicted in the interval from 180° to 360°. When converted to conventional notation, the individual data retransformed are expressed as a 95% tolerance area looks elliptical. The 95% tolerance ellipse for SIA was smaller in Group B.


Comparison of surgically induced astigmatisms after clear corneal incisions of different sizes.

Moon SC, Mohamed T, Fine IH - Korean J Ophthalmol (2007)

SIA; individual values in Group C at 12 months.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2629691&req=5

Figure 5: SIA; individual values in Group C at 12 months.
Mentions: Fig. 3, 4 and 5 show the individual pairs of polar values at 12 months. It is possible to perform a point-to-point retransformation to conventional notation. Net astigmatisms are symbols, and no calculation can be performed with these entities. For each pair of polar values, there are two solutions of net astigmatisms: one in the interval from 0° to 180° rotation around origio and one depicted in the interval from 180° to 360°. When converted to conventional notation, the individual data retransformed are expressed as a 95% tolerance area looks elliptical. The 95% tolerance ellipse for SIA was smaller in Group B.

Bottom Line: This work was designed as a retrospective, comparative, nonrandomized interventional study.All procedures were performed with the temporal approach of self-sealing incisions.Keratometric data were obtained preoperatively, and 3 weeks, 3 months, 6 months, 9 months, 12 months, 24 months and 36 months postoperatively.

View Article: PubMed Central - PubMed

Affiliation: Oregon Eye Institute, Eugene, Oregon 97401, USA. sungcmoon@hanmail.net

ABSTRACT

Purpose: This study was performed to assess efficiency and stability of astigmatic change by incision size after cataract surgery.

Methods: This work was designed as a retrospective, comparative, nonrandomized interventional study. A total of 121 cases of cataract surgery were reviewed in 98 patients performed by one surgeon at the Oregon Eye Institute in Eugene, OR, USA with 3-year follow-ups. All procedures were performed with the temporal approach of self-sealing incisions. The serial change in surgically induced astigmatisms were examined in all cases of three groups: Group A, cartridge injection of a foldable IOL through a 2.5 mm self-sealing incision; Group B, cartridge injection of a foldable IOL through a 3.0 mm self-sealing incision; Group C, cartridge injection of a foldable IOL through a 3.5 mm self-sealing incision. Keratometric data were obtained preoperatively, and 3 weeks, 3 months, 6 months, 9 months, 12 months, 24 months and 36 months postoperatively. Polar value analysis was performed to calculate the surgically induced astigmatism.

Results: The astigmatic change decreased over time in Group B (P<0.05). The other groups tended to remain in induced astigmatism. All groups showed anticlockwise torque at 3 weeks following surgery. Group B showed a decrease in deviation, but the other groups showed increases in their torque value at postoperative 12 months (P<0.05).

Conclusions: The 3.0 mm incision size correlated with the least surgically induced astigmatism.

Show MeSH
Related in: MedlinePlus