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Postoperative astigmatic outcomes based on the haptic axis of intraocular lenses inserted in cataract surgery.

Kim IT, Park HY, Kim HS - Korean J Ophthalmol (2011)

Bottom Line: These two groups of eyes were then each divided into 2 groups based on whether the haptic axis of the inserted IOL was at 180° or 90°.There was no difference in corneal astigmatism, but WTR patients with a 180° haptic axis of the inserted IOL and ATR patients with a 90° hepatic axis of the inserted IOL had a significant decrease in postoperative refractive astigmatism (p < 0.05).Insertion of the IOL at the 180° haptic axis in WTR patients and at 90° in ATR patients during cataract surgery may have an effect in reducing pre-existing astigmatism.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.

ABSTRACT

Purpose: This study was conducted to compare post-operative astigmatic outcomes of two groups, with-the-rule (WTR) and against-the-rule (ATR) astigmatism patients, according to the haptic axis of intraocular lenses (IOLs) inserted in cataract surgery.

Methods: Seventy-two eyes with WTR astigmatism and 79 eyes with ATR astigmatism had cataract surgery through a clear corneal temporal incision. These two groups of eyes were then each divided into 2 groups based on whether the haptic axis of the inserted IOL was at 180° or 90°. For ATR patients, the outcomes were analyzed according to the three types of IOLs.

Results: There was no difference in corneal astigmatism, but WTR patients with a 180° haptic axis of the inserted IOL and ATR patients with a 90° hepatic axis of the inserted IOL had a significant decrease in postoperative refractive astigmatism (p < 0.05). The changes in ATR astigmatism according to the IOL type were more effective in single-piece acrylic IOLs than in the three-piece polymethylmethacrylate haptic IOL group.

Conclusions: Insertion of the IOL at the 180° haptic axis in WTR patients and at 90° in ATR patients during cataract surgery may have an effect in reducing pre-existing astigmatism. This observed effect was not consistent among the different types of IOLs.

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The changes in mean astigmatism by intraocular lens (IOL) axis in against-the-rule (ATR) astigmatic patients. Single-piece hydrophobic acrylic IOL group by refraction (A) and topography (B). Single-piece hydrophilic acrylic IOL group by refraction (C) and topography (D). Three-piece acrylic optic with polymethylmethacrylate (PMMA) haptic group by refraction (E) and topography (F) (*p < 0.05 indicates p-value compared with the preoperative values).D = diopters.
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Figure 3: The changes in mean astigmatism by intraocular lens (IOL) axis in against-the-rule (ATR) astigmatic patients. Single-piece hydrophobic acrylic IOL group by refraction (A) and topography (B). Single-piece hydrophilic acrylic IOL group by refraction (C) and topography (D). Three-piece acrylic optic with polymethylmethacrylate (PMMA) haptic group by refraction (E) and topography (F) (*p < 0.05 indicates p-value compared with the preoperative values).D = diopters.

Mentions: In the first sub-group (single-piece hydrophobic acrylic IOL), there was no significant difference in corneal astigmatism between insertion of the IOL at the 180° or 90° haptic axis. Refractive astigmatisms of those with IOLs inserted at the 180° haptic axis were 1.15 ± 0.84 D, 0.92 ± 0.48 D, and 0.98 ± 0.54 D 1 week, 1 month, and 2 months post-operatively, respectively. The corresponding post-operative refractive astigmatisms of those with IOLs inserted at the 90° haptic axis were 0.65 ± 1.10 D, 0.53 ± 0.83 D, and 0.59 ± 0.47 D, respectively. There was a significant difference 1 week, 1 month, and 2 months post-operatively between insertion of the IOL at the 180° or 90° haptic axis (p = 0.031, 0.047, and 0.045, respectively). Compared with pre-operative astigmatism values, there were no changes in corneal astigmatism post-operatively (Fig. 3B), but there was a significant decrease in refractive astigmatism 1 week, 1 month, and 2 months after the operation (Fig. 3A, indicated as * in the figure).


Postoperative astigmatic outcomes based on the haptic axis of intraocular lenses inserted in cataract surgery.

Kim IT, Park HY, Kim HS - Korean J Ophthalmol (2011)

The changes in mean astigmatism by intraocular lens (IOL) axis in against-the-rule (ATR) astigmatic patients. Single-piece hydrophobic acrylic IOL group by refraction (A) and topography (B). Single-piece hydrophilic acrylic IOL group by refraction (C) and topography (D). Three-piece acrylic optic with polymethylmethacrylate (PMMA) haptic group by refraction (E) and topography (F) (*p < 0.05 indicates p-value compared with the preoperative values).D = diopters.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3039190&req=5

Figure 3: The changes in mean astigmatism by intraocular lens (IOL) axis in against-the-rule (ATR) astigmatic patients. Single-piece hydrophobic acrylic IOL group by refraction (A) and topography (B). Single-piece hydrophilic acrylic IOL group by refraction (C) and topography (D). Three-piece acrylic optic with polymethylmethacrylate (PMMA) haptic group by refraction (E) and topography (F) (*p < 0.05 indicates p-value compared with the preoperative values).D = diopters.
Mentions: In the first sub-group (single-piece hydrophobic acrylic IOL), there was no significant difference in corneal astigmatism between insertion of the IOL at the 180° or 90° haptic axis. Refractive astigmatisms of those with IOLs inserted at the 180° haptic axis were 1.15 ± 0.84 D, 0.92 ± 0.48 D, and 0.98 ± 0.54 D 1 week, 1 month, and 2 months post-operatively, respectively. The corresponding post-operative refractive astigmatisms of those with IOLs inserted at the 90° haptic axis were 0.65 ± 1.10 D, 0.53 ± 0.83 D, and 0.59 ± 0.47 D, respectively. There was a significant difference 1 week, 1 month, and 2 months post-operatively between insertion of the IOL at the 180° or 90° haptic axis (p = 0.031, 0.047, and 0.045, respectively). Compared with pre-operative astigmatism values, there were no changes in corneal astigmatism post-operatively (Fig. 3B), but there was a significant decrease in refractive astigmatism 1 week, 1 month, and 2 months after the operation (Fig. 3A, indicated as * in the figure).

Bottom Line: These two groups of eyes were then each divided into 2 groups based on whether the haptic axis of the inserted IOL was at 180° or 90°.There was no difference in corneal astigmatism, but WTR patients with a 180° haptic axis of the inserted IOL and ATR patients with a 90° hepatic axis of the inserted IOL had a significant decrease in postoperative refractive astigmatism (p < 0.05).Insertion of the IOL at the 180° haptic axis in WTR patients and at 90° in ATR patients during cataract surgery may have an effect in reducing pre-existing astigmatism.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology and Visual Science, Yeouido St. Mary's Hospital, The Catholic University of Korea School of Medicine, Seoul, Korea.

ABSTRACT

Purpose: This study was conducted to compare post-operative astigmatic outcomes of two groups, with-the-rule (WTR) and against-the-rule (ATR) astigmatism patients, according to the haptic axis of intraocular lenses (IOLs) inserted in cataract surgery.

Methods: Seventy-two eyes with WTR astigmatism and 79 eyes with ATR astigmatism had cataract surgery through a clear corneal temporal incision. These two groups of eyes were then each divided into 2 groups based on whether the haptic axis of the inserted IOL was at 180° or 90°. For ATR patients, the outcomes were analyzed according to the three types of IOLs.

Results: There was no difference in corneal astigmatism, but WTR patients with a 180° haptic axis of the inserted IOL and ATR patients with a 90° hepatic axis of the inserted IOL had a significant decrease in postoperative refractive astigmatism (p < 0.05). The changes in ATR astigmatism according to the IOL type were more effective in single-piece acrylic IOLs than in the three-piece polymethylmethacrylate haptic IOL group.

Conclusions: Insertion of the IOL at the 180° haptic axis in WTR patients and at 90° in ATR patients during cataract surgery may have an effect in reducing pre-existing astigmatism. This observed effect was not consistent among the different types of IOLs.

Show MeSH
Related in: MedlinePlus