Limbal Relaxing Incision Versus Toric Intraocular Lens for Corneal Astigmatism During Cataract Surgery.

Not Applicable

• Conditions: Astigmatism; Cataract
• Interventions: Device: Toric Intraocular Lens; Procedure: Limbal Relaxing Incisions

• Registration Number: NCT02067429
• Lead Sponsor: Christin Henein

Brief Summary

This study will compare toric intra-ocular lens (IOL) with limbal relaxing incisions (LRI) in correcting astigmatism in patient undergoing standard cataract surgery.

Astigmatism is unequal curvature of the eye; the eye is oval rather than spherical. Uncorrected astigmatism of greater than approximately 0.75 diopters (D) can cause visual blurring, ghosting of images or halos. Over 20% of patients undergoing cataract surgery have astigmatism which is likely to have been corrected by spectacles.

Cataract surgery involves the replacement of the natural opacifying crystalline lens with a clear artificial plastic intra-ocular lens (IOL). The lens power can be selected to correct the patient's glasses prescription. The most widely used IOLs only correct glasses at one distance i.e. either near or distance. Residual astigmatism after cataract surgery will need glasses for correction which is undesirable for many patients.

Limbal relaxing incisions (LRI) are circumferential partial thickness cuts to the clear window of the eye (cornea) during surgery. These LRIs can correct corneal astigmatism and have no additional risk of complications.

Alternatively, toric IOLs are available which correct astigmatism inside the eye. They have been available for routine use in the last few years; technology has markedly improved and the lenses have become cheaper.

Studies have suggested toric IOLs provide better vision after cataract surgery than the regular IOLs. Toric IOL are widely used in the private practice and increasingly in the National Health Service (NHS). LRIs are cost effective for treating astigmatism however their predictability is believed to be lower than toric IOLs. As there are no randomised controlled trials comparing the outcomes between LRIs and toric IOLs. This research will address this gap in knowledge and accordingly from this research future practice will be able to provide treatment to patients with information about the best outcomes.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2014-02-17
• Study First Submitted QC: 2014-02-18
• Study First Posted: 2014-02-20
• Study Start: 2014-06
• Status Verified: 2014-11
• Last Update Submitted: 2014-11-27
• Last Update Posted: 2014-12-02
• Primary Completion: 2015-12

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 80

Inclusion Criteria

1. Symptomatic cataract for which the patient desires surgery
2. Corneal astigmatism of greater than or equal to 0.75 D and lesser than or equal to 2.5D.
3. No significant ophthalmic co-morbidity which would affect the postoperative visual outcomes.

Exclusion Criteria

1. <18 years of age
2. Significant ophthalmic comorbidity detrimental to final visual outcomes
3. Not competent to give consent
4. Concurrent use of ocular medications including lubricants
5. Unable to attend follow ups at 1, 3, 6 and 12 months.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Toric Intraocular lens	Toric Intraocular Lens	Toric intraocular lens implantation during standard cataract surgery
Limbal Relaxing Incisions	Limbal Relaxing Incisions	Limbal relaxing incisions during standard cataract surgery

Primary Outcome Measures

Name	Time	Method
Unaided distance LogMAR visual acuity (UDVA)	12 months

Trial Locations

Locations (1)

Sussex Eye Hospital; 🇬🇧 Brighton, United Kingdom