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Visual outcome and rotational stability of open loop toric intraocular lens implantation in Indian eyes.

Venkataraman A, Kalpa - Indian J Ophthalmol (2013)

Bottom Line: Ninety-four percent of patients had uncorrected visual acuity of 20/30 or better.At 12 months, 96.7% of the IOLs were within 10 degrees of the target axis.There was no rotation seen after 6 months.

View Article: PubMed Central - PubMed

Affiliation: Anterior Segment and corneal Surgery, Dr. Arvind Vision Care Eye Hospital, 61, Reddypalayam Road, Mogappair West; Vasan Eye Care Hospital, M77 3rd Avenue, Anna Nagar East, Chennai, Tamil Nadu, India.

ABSTRACT

Purpose: To assess the visual outcome and rotational stability of single-piece open loop toric Intra Ocular Lens (IOL) in a clinical setting.

Materials and methods: In a prospective study, 122 eyes of 77 patients were followed up for a period of 12 months after cataract surgery with toric open loop IOL implantation. The pre-operative markings for the position of incision and IOL placement were done under slit lamp by anterior stromal puncture. The visual acuity, refraction, and IOL position were assessed at day 1, 1 week, 1 month, 3 months, 6 months, and 12 months after surgery.

Results: The mean age of the cohort was 56 yrs (S.D. 13.88; range 16 to 87 years). The mean pre-operative cylinder of corneal astigmatism was 1.37 D. (SD 0.79, range 1.0 to 5.87 D). Mean post-operative refractive cylinder was 0.36 D (SD 0.57, range 0 to 1.50 D) at 12 months. Ninety-seven percent of the eyes were within 1 D of residual astigmatism. Ninety-four percent of patients had uncorrected visual acuity of 20/30 or better. Four eyes required IOL repositioning due to rotation. At 12 months, 96.7% of the IOLs were within 10 degrees of the target axis. There was no rotation seen after 6 months.

Conclusion: Toric IOLs are very effective and consistent in correcting astigmatism during the cataract surgery. IOL rotation happens mostly within a month of surgery, and if significant, requires early repositioning.

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Related in: MedlinePlus

Residual refractive cylinder by model
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Figure 2: Residual refractive cylinder by model

Mentions: The toric IOLs used were SN60T3 to SN60T9. T3 was the most commonly used toric IOL model. Most of the IOL implanted have a power in the range of 20-25 D. The post-operative residual cylinder at 12 months was 0.36 D (SD 0.57, range 0 to 1.50 D), and 94% of the eyes had less than 1 D of residual astigmatism [Fig. 1]. Fig. 2 summarizes the mean post-operative residual refractive cylinder for the different models. The target post-operative spherical refraction was -0.19 D (SD 0.27), and actual post-operative residual sphere was -0.32 D (SD 0.08, range -1.25 to + 0.75 D), and SRK-T formula was used in 75 patients.


Visual outcome and rotational stability of open loop toric intraocular lens implantation in Indian eyes.

Venkataraman A, Kalpa - Indian J Ophthalmol (2013)

Residual refractive cylinder by model
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3959075&req=5

Figure 2: Residual refractive cylinder by model
Mentions: The toric IOLs used were SN60T3 to SN60T9. T3 was the most commonly used toric IOL model. Most of the IOL implanted have a power in the range of 20-25 D. The post-operative residual cylinder at 12 months was 0.36 D (SD 0.57, range 0 to 1.50 D), and 94% of the eyes had less than 1 D of residual astigmatism [Fig. 1]. Fig. 2 summarizes the mean post-operative residual refractive cylinder for the different models. The target post-operative spherical refraction was -0.19 D (SD 0.27), and actual post-operative residual sphere was -0.32 D (SD 0.08, range -1.25 to + 0.75 D), and SRK-T formula was used in 75 patients.

Bottom Line: Ninety-four percent of patients had uncorrected visual acuity of 20/30 or better.At 12 months, 96.7% of the IOLs were within 10 degrees of the target axis.There was no rotation seen after 6 months.

View Article: PubMed Central - PubMed

Affiliation: Anterior Segment and corneal Surgery, Dr. Arvind Vision Care Eye Hospital, 61, Reddypalayam Road, Mogappair West; Vasan Eye Care Hospital, M77 3rd Avenue, Anna Nagar East, Chennai, Tamil Nadu, India.

ABSTRACT

Purpose: To assess the visual outcome and rotational stability of single-piece open loop toric Intra Ocular Lens (IOL) in a clinical setting.

Materials and methods: In a prospective study, 122 eyes of 77 patients were followed up for a period of 12 months after cataract surgery with toric open loop IOL implantation. The pre-operative markings for the position of incision and IOL placement were done under slit lamp by anterior stromal puncture. The visual acuity, refraction, and IOL position were assessed at day 1, 1 week, 1 month, 3 months, 6 months, and 12 months after surgery.

Results: The mean age of the cohort was 56 yrs (S.D. 13.88; range 16 to 87 years). The mean pre-operative cylinder of corneal astigmatism was 1.37 D. (SD 0.79, range 1.0 to 5.87 D). Mean post-operative refractive cylinder was 0.36 D (SD 0.57, range 0 to 1.50 D) at 12 months. Ninety-seven percent of the eyes were within 1 D of residual astigmatism. Ninety-four percent of patients had uncorrected visual acuity of 20/30 or better. Four eyes required IOL repositioning due to rotation. At 12 months, 96.7% of the IOLs were within 10 degrees of the target axis. There was no rotation seen after 6 months.

Conclusion: Toric IOLs are very effective and consistent in correcting astigmatism during the cataract surgery. IOL rotation happens mostly within a month of surgery, and if significant, requires early repositioning.

Show MeSH
Related in: MedlinePlus