|Year : 2017 | Volume
| Issue : 4 | Page : 282-285
Posterior iris-claw intraocular lens implantation as an effective option in aphakia
M Periyanayagi, Nithiya Selvaraj, M Sivakami
Uvea and Retina Services, Regional Institute of Ophthalmology, Government Ophthalmic Hospital, Chennai, Tamil Nadu, India
|Date of Web Publication||25-Apr-2018|
Dr. M Periyanayagi
Uvea and Retina Services, Regional Institute of Ophthalmology, Government Ophthalmic Hospital, Egmore, Chennai-600 008, Tamil Nadu
Source of Support: None, Conflict of Interest: None
Aim: This study aims to evaluate the safety, effectiveness, and complications of posterior iris-claw intraocular lens (IOL) in aphakic patients with inadequate capsular support. Patients and Methods: This prospective interventional study was conducted in 100 eyes of 99 patients between July 2013 and June 2017. Surgical aphakia with inadequate capsular support, large zonular dialysis, subluxated lens, dislocated lens, dislocated IOL, and aphakia following congenital cataract surgery were included. Preoperative and postoperative best-corrected visual acuity (BCVA) and the occurrence of various vision-threatening complications such as iridocyclitis, decentration, vitritis, cystoid macular edema, and retinal detachment were considered during the follow-up period. Results: One hundred eyes of 99 patients who fulfilled the criteria were included. The mean follow-up period was 13.5 months (4–24 months). About 90% of patients had improvement in vision with postoperative BCVA of 6/12–6/6, 7% had visual improvement with postoperative BCVA of 6/18–6/36, and 3% had a drop in visual acuity with BCVA < 6/60. About 15% developed iridocyclitis in the immediate postoperative period and responded well to topical steroids. Nearly 2% developed vitritis during the follow-up period and 1% developed rhegmatogenous retinal detachment. None had decentration or cystoid macular edema during the follow-up period. Conclusion: Posterior iris-claw IOL implantation is a safe, effective, and timely procedure in aphakia with inadequate capsular support in the hands of a skilled experienced surgeon.
Keywords: Aphakia, posterior iris-claw intraocular lens, secondary intraocular lens
|How to cite this article:|
Periyanayagi M, Selvaraj N, Sivakami M. Posterior iris-claw intraocular lens implantation as an effective option in aphakia. TNOA J Ophthalmic Sci Res 2017;55:282-5
|How to cite this URL:|
Periyanayagi M, Selvaraj N, Sivakami M. Posterior iris-claw intraocular lens implantation as an effective option in aphakia. TNOA J Ophthalmic Sci Res [serial online] 2017 [cited 2020 Jul 12];55:282-5. Available from: http://www.tnoajosr.com/text.asp?2017/55/4/282/231126
| Introduction|| |
In-the-bag implantation of intraocular lens (IOL) is the basic standard of care in cataract surgery. In aphakia with good capsular support, three-piece ciliary sulcus placed IOL is the best option. In cases such as complicated cataract surgery with inadequate capsular support, traumatic dislocation of lens, subluxation of lens as in Marfan syndrome, and aphakia following congenital cataract surgery, the various surgical options available to correct aphakia are anterior chamber IOL (ACIOL), iris-claw anterior and posterior IOL, scleral fixated IOL (SFIOL), and more recently, glued IOL. In this study, the effectiveness, safety, and complications related to posterior iris-claw implantation are evaluated. Dr. Cornelius Binkhorst first introduced four-loop and later modified to two-loop iris-supported IOLs in an intact posterior capsule also called iridocapsular IOLs to overcome the disadvantages of dislocation of Ridley's posterior chamber lens and increased risk of corneal decompensation in ACIOLs. Later, Professor Jan Worst attempted to improve the stability of IOL without interfering with pupillary dilatation and introduced the modern design of iris-claw IOLs in 1972. In 1997, it was further modified from a circular haptic to a more oval and larger haptic to aid in easy enclavation to iris tissue [Figure 1].
|Figure 1: Worst iris–claw intraocular lens (left) and modified iris–claw intraocular lens (right)|
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ACIOLs in spite of easy surgical procedure have the risk of increased corneal endothelial loss which can lead to decompensation, raised IOP causing secondary glaucoma, iris chafing, and poor pupillary dilatation if requires a retinal evaluation and procedures at later date.
SFIOLs though closely resemble the anatomical position of the lens has a steep learning curve and a long surgical procedure considered a major disadvantage among the fast-paced surgeons of today. Sutures tied to sclera can cause tilting of the lens leading to blinding astigmatism or sutures degenerate in long-term leading to decentration or dislocation of the IOL into the vitreous cavity.,, Sutures can also erode the conjunctiva and become exposed causing irritation and granuloma formation.
Posterior iris-claw IOLs have less risk of corneal endothelial damage and secondary glaucoma than ACIOLs, clipped to the immobile midperiphery portion of iris can achieve good pupillary dilation, less risk of tilting of IOL causing astigmatism though this can occur when equal enclavation is not done, and less inflammation in the hands of skilled surgeons. The greater advantage is the centration and stability of the IOL [Figure 2].
| Patients and Methods|| |
A prospective interventional study was done on 100 eyes of 99 patients from July 2013 to June 2017 at Regional Institute of Ophthalmology Government Ophthalmic Hospital, Chennai.
- Preoperative best-corrected visual acuity (BCVA) >6/36
- Healthy iris tissue
- Aphakia due to complicated cataract surgery and subluxated and dislocated lens.
- Eyes with glaucoma
- Intraocular inflammation
- Posterior segment pathology.
Preoperative evaluations included BCVA, intraocular pressure measurement using Goldmann applanation tonometry, thorough slit-lamp examination of cornea and iris tissue, posterior segment evaluation using +90D biomicroscopy and indirect ophthalmoscopy with +20D, and keratometry, and A-scan reading was measured to calculate the IOL power with 117.2 as the A constant (Optima ®) using SRK II formula. In pediatric cases, optic size of 4.5 mm was used. Postoperative examinations were done on the 1st day, 1st week, 6th week, 3rd month, and later individualized to patient's condition.
Under peribulbar anesthesia, sclerocorneal tunnel of 5.5 mm was made, and two side ports at 3'O and 9'O CP were made. A thorough anterior vitrectomy was done using a mechanical vitrector. About 0.5% pilocarpine was injected intracamerally for a good pupillary constriction which aids in good centration of IOL. Posterior iris-claw IOL was introduced into the anterior chamber using iris-claw holding forceps and one of the haptics is brought behind the iris and enclaved using a blunt-tipped instrument taking care avoiding too much pressure. Similarly, the second haptic is brought under iris and enclaved. The IOL is gently tapped at the center to ensure its clipping and a slight dimple is confirmed at the iris midperiphery. Scleral wound was closed with 10–0 silk suture. In case of dislocated lens, pars plana vitrectomy and lens removal were combined. Postoperative BCVA using Snellen chart and signs of inflammation (cells, flare, and pigment dispersion) were noted on slit-lamp examination. During the follow-up period, patients were examined for decentration and dislocation of IOL, iridocyclitis, cystoid macular edema, vitritis, and retinal detachment.
| Results|| |
One-hundred eyes of 99 patients were included in the study. Four eyes were in the age group of 0–10 years, of which 2 eyes had subluxated natural lens and 2 eyes were aphakic following congenital cataract surgery; Three eyes between 31 and 40 years; 31 eyes between 41 and 50 years; 34 eyes between 51 and 60 years; and 22 eyes between 61 and 70 years. The mean age of patients was 50.5 years (5–68 years) [Figure 3].
|Figure 3: Bar diagram showing the age distribution among patients included in the study|
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Of the 99 patients, 56 (56.6%) were male and 43 (43.4%) were female. The increase in frequency among males was attributed to the common occurrence of trauma among males causing subluxated or dislocated lens or IOL [Figure 4].
Various indications for surgery were posterior capsular rupture with inadequate posterior capsule in 62%, large zonular dialysis in 12%, subluxated lens in 10%, dislocated lens in 11%, dislocated IOL in 3%, and aphakia following congenital cataract surgery in 2% [Table 1] and [Figure 5].
|Figure 5: Bar diagram showing distribution of causes of aphakia in patients|
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There were no preoperative complications. IOL was well centered in all patients. Of the 100 eyes, 90 eyes had a BCVA of 6/12–6/6, 7 eyes had BCVA 6/18–6/36, and 3 eyes had BCVA of <6/60 at 6-week postoperative period. Of the 3 patients with <6/60 BCVA, 2 developed vitritis and 1 patient developed rhegmatogenous retinal detachment. None of the patients developed cystoid macular edema, subluxation, or dislocation of IOL during the follow-up period [Figure 6].
|Figure 6: Bar diagram showing visual outcome following posterior iris–claw intraocular lens implantation|
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During the follow-up period, 15% developed iridocyclitis and responded well to topical corticosteroids and cycloplegics, 2% developed vitritis and were treated with periocular steroid, and 1% developed rhegmatogenous retinal detachment who underwent scleral buckling surgery [Figure 7].
| Discussion|| |
Aphakia is no more an option in the armamentarium of ophthalmic practice. Spectacle aberration of aphakic glasses and demanding manual dexterity of contact lenses have been superseded with surgical correction of aphakia. The various methods of surgical correction of aphakia are ACIOLs, SFIOLs, and anterior and posterior iris-claw IOLs.
This study emphasizes on the safety and effectiveness of posterior iris-claw IOLs in the management of aphakia with its advantages of having speedy learning curve, well-centered IOL, and less chances of corneal–endothelial damage or intraocular pressure rise.
In the study, 90% of patients had a visual improvement >6/12 which is comparable to the results of Gonnermann et al. study group. In this study, 15% developed iridocyclitis on the 1st day of surgery and responded well to topical steroids along with cycloplegia. Two percent developed vitritis during the follow-up period and were treated with periocular steroids and 1% developed a rhegmatogenous retinal detachment and underwent external scleral buckling. Gonnermann et al. also studied the frequency of complications and found them relatively low compared to other options available for surgical aphakic correction. No eyes had clinically significant pigment dispersion, cystoid macular edema, secondary glaucoma, subluxation, or dislocation of IOL.
Huang et al. have reported significant long-term endothelial cell loss and secondary glaucoma in flexible open-loop ACIOLs.,
SFIOL polypropylene sutures degrade over time causing dislocation or subluxation of IOL requiring a repeat surgery. Studies have shown the rate of suture degradation between 7.8% and 27.9%. Posterior iris-claw IOL fills this vacuum and is a better option while considering for the pediatric age group, thus providing a long-term benefit.
In this study, two eyes with ectopia lentis in the pediatric age group were included with improvement in postoperative visual outcome and the results were comparable to that of Cleary et al's. study. The benefit–cost ratio is higher compared to glued IOLs and can be taken as a preferred choice in our developing nation.
Posterior iris-claw implantation can be performed less invasively within a short surgical duration with an excellent visual outcome in patients undergoing pars plana vitrectomy following lens dislocation or IOL dislocation into the vitreous cavity.
| Conclusion|| |
As a serendipitous invention by Binkhorst and later modified by Worst following keen observation and experience, posterior iris-claw IOLs having stood the test of time has been serving as a safe, effective, timeless as well as a timely option in the surgical correction of aphakia.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]