Comparison of anterior chamber reaction with single-piece and three-piece intraocular lenses in manual small incision cataract surgery.
MATERIAL AND METHODS: This is a prospective study done at Mysore Race Club Charitable Eye Hospital from June 2008 to July 2009. 168 eyes of 168 patients underwent suture less sclerocorneal tunnel cataract surgeries with polymethyl methacrylate intraocular lenses. 140 patients out of 168 qualified for this study due to lack of follow up. A single surgeon performed all these surgeries.
EXCLUSION CRITERIA: Complicated cataract, traumatic cataract, corneal opacities, corneal degenerations, uveitis, pseudo exfoliation, glaucoma, connective tissue disorders, and previous ocular surgeries, pathological conditions of the optic nerve and retina, external eye diseases, uncontrolled diabetes, uncontrolled hypertension.
INCLUSION CRITERIA: Senile/ pre senile cataract, including mature and immature cataract, well dilated pupil. Informed consent obtained in every case, with age group ranging from 40 years to70 years. Preoperative visual acuity assessed in all 140 patients, nasolacrimal duct patency noted, intraocular pressure estimated with Goldmann Applanation Tonometer. Blood pressure recorded, urine sugar strip test was done. Fundus examination was done with indirect ophthalmoscope by using 20D lens and 90D lenses wherever possible. Using Bausch Lomb Keratometer and non-immersion contact type A-scan Biometry IOL power was calculated by using SRK II formula.
Preoperatively, ciprofloxacin eye drops instilled hourly into conjunctival sac, 24 hours prior to surgery. Flurbiprofen 0.3% eye drops, tropicamide 0.8%, and phenylephrine 5% eye drops started 2 hours before surgery at an interval of 15 minutes. Proper aseptic precautions were taken and 7mm conjunctival peritomy done. A frown incision of 6mm was made on superior aspect of sclera with No.11 Bard parker blade, the summit of which was 1.5mm away from the limbus. Sclerocorneal tunnel was made with a 2.6mm crescent blade, extended 1.0mm anteriorly into the cornea. Paracentesis was done anterior chamber was maintained with 2% hydroxypropyl methylcellulose (HPMC).
A 6 to 6.5mm continuous curvilinear capsulorhexis (CCC) was done with cystitome. Anterior chamber was entered with the help of a keratome. A good cortical cleaving hydrodissection was done in relevant cases. Nucleus was prolapsed into anterior chamber with a lens dialler/sinskey hook. Irrigating vectis was used to deliver the nucleus. Thorough cortical wash was done in all cases with a two-way 22 guage Simcoe cannula and bulb. A three-piece IOL/single-piece polymethyl methacrylate IOL of 6mm optic size was placed inside the bag depending upon randomly assorted cases with 70 in each group. Viscoelastic substance was thoroughly washed and the anterior chamber was formed by ringer lactate solution.
The wound integrity was checked after releasing superior rectus bridle suture. A subconjunctival injection of 0.5ml of gentamycin and 0.5ml of dexamethasone was given at the end of surgery. Postoperatively, a combination of chloramphenicol 0.5% and dexamethasone 0.1% eye drops were given 8times/day. cyclopentolate 1% eye drops thrice a day were advised and was slowly tapered depending upon observation over a period of 8 to 10 weeks. Slit lamp examination of anterior chamber cells were graded according to Hogan system (1) at 1st postoperative (postop) day, 1 postop week and 8th postop weeks. Aqueous cells were measured by counting within the visible field under slit lamp, keeping the beam at maximum intensity.
Grade Cells per field in a 2mm height, 1mm width light beam of slit lamp 0 0 1+ 5-10 2+ 10-20 3+ 20-50 4+ > 50
RESULTS: Age distribution of patients with respect to single-piece and three-piece IOLs are shown below.
Single piece IOL 3 Piece IOL Age in Total years No of Percentage No of Percentage patients patients 40-49 2 2% 3 4 5 (3.57%) 50-59 21 30% 22 31.42 43 (30.71%) 60-69 31 44.2% 28 40 59 (42.14%) >70 16 22.8% 17 24.28 33 (23.57%) Total 70 100% 70 100% 140 (100%)
Patients more than 60 years of age of which 67% had single-piece IOL insertion and 65% had 3-piece IOL insertion.
Single piece IOL 3 Piece IOL Nuclear Total grading No of Percent No of Percent patients patients [N.sub.2] 7 10% 5 7.1% 12 (8.57%) [N.sub.3] 36 51.4% 39 55.7% 75 (53.5%) [N.sub.4] 24 34.2% 21 30% 45 (32.1%) SMC 3 4.2% 5 7.1% 8 (5.7%) Total 70 100% 70 100% 140 (100%)
Intraoperative complications were nil in this study.
SLITLAMP EXAMINATION AT 1 WEEK: Single piece IOL had AC reaction ranging from 1 to2+ cells i.e., in 97%. In three-piece IOL group, 70% of eyes had 2+ cells and 12.8% had 3+ cells in anterior chamber. One case in three-piece IOL group had 4+ cells, though the surgery in this case was uncomplicated, mostly because of noncompliance; after rigorous treatment with topical and systemic steroids, she ultimately had best corrected visual acuity of 6/6 at the end of 8 weeks follow up. The AC reaction in 1st Postoperative week in Single-piece and 3-piece IOL.
Single piece IOL Three piece IOL AC Reaction No % No % 0 -- -- -- -- 0.5+ -- -- -- -- 1 + 35 50 11 15.8 2 + 33 47.1 49 70 3 + 2 2.9 9 12.8 4+ -- -- 1 1.4 Total 70 100 70 100
At the end of 8 weeks showed, in the eyes where single-piece IOL was implanted there were either no cells or occasional cells in 69 out of 70 eyes(98.6%);whereas in three-piece IOL group 54 out 70(77%)had either no cells or occasional cells. The remaining 16 eyes (23%) had 1 + cells, they did not complain of pain or redness or blurred vision. Statistical analysis shows that, anterior chamber cells significantly decreased from 1week to 8 weeks follow up in both the groups with value significance (p<0.05).In single piece implanted IOLs statistically significant less number of cells were seen in anterior chamber from 1week to 8weeks as compared to three-piece IOLs with significance(sig) 0.006 i.e., p<0.05.
A.C Reaction at 1st week single piece 3 piece 0 0 0.5+ 0 0 1+ 50 15.8 2+ 47.1 70 3+ 2.9 12.8 4+ 0 1.4 Note: Table made from line graph.
A C reaction at 8th postoperative week.
AC Cells Single- piece IOL Three- piece IOL No % No % 0 31 44.3 18 25.7 0.5+ 38 54.3 36 51.42 1 + 1 1.4 16 22.9 2 + -- -- -- -- 3 + -- -- -- -- 4+ -- -- -- -- Total 70 100 70 100
AC reaction in three-piece and single-piece IOL at 8 weeks.
single piece 3 piece 0 44.3 25.7 0.5+ 54.3 51.42 1+ 1.4 22.9 2+ 0 3+ 0 4+ 0 Note: Table made from line graph.
Repeated measure ANOVA test was done to analyze these findings.
Source Type III sum df Mean F Significance of squares squares (P-Value) 1 week to 8 130.972 1 130.972 751.693 0.000 weeks Single piece 1.358 1 1.358 7.794 0.006 IOL reaction to 3-piece IOL reaction
F=Fischer value df=Degree of freedom P=Probability
Duration Lens Mean value Standard Number of AC cells deviation of eyes 1 week Single-piece 1.5143 0.5580 70 3-piece 2.0000 0.5898 70 Total 1.7571 0.6218 140 8 weeks Single-piece 0.2857 0.2634 70 3-piece 0.4929 0.3457 70 Total 0.3893 0.3234 140 Three - piece IOL Single-piece IOL UCVA Preoperative Postoperative Preoperative Postoperative No % No % No % No % <6/60 42 60 0 -- 37 52.9 0 -- 6/60-6/18 28 40 6 8.6 33 47.1 4 5.7 6/18-6/12 -- -- 17 24.3 -- -- 14 20 6/9-6/6 -- -- 47 67.1 -- -- 52 74.3 Total 70 100 70 100 70 100 70 100
UCVA (Uncorrected visual acuity) in three piece IOL and Single piece IOL groups at 8th postoperative weeks.
91% in three-piece IOL group and 94% in single-piece IOL group had UCVA of >6/18.
POSTOPERATIVE COMPLICATIONS: Posterior capsular opacification developed in three-piece IOL case at 8 weeks. Cystoid macular edema developed in two cases, one in three-piece IOL group and another in single-IOL case at 8 weeks. There were no major complications like posterior capsular tear, wound leak, secondary glaucoma, retinal detachment or endophthalmitis.
DISCUSSION: Jaffe (2), Roger steinert (3): Found that postoperative uveitis may occur in cases with PMMA IOLs especially with prolene/ polypropylene loops (3-piece IOLs) due to;
* Initial activation of high level of complements which leads to generation of biologically active C5 derived peptides.
* C5 derived peptide induces increased vascular hypermeability, anaphylatoxin activity, limbal flux, uveal leakages which perpetuates leakage of complement components and IgG into the eye.
Complement components amplify the sequence of complement activation while IgG coats the PMMA, forming immunoglobulin aggregates. PMMA bound IgG further activates compliment. Leucocytes are augmented as a result of degeneration of C5 derived chemotactic peptides like cells, keratic precipitates and hypopyon.
Anterior chamber cellular reaction is comparable with other studies like Lt. col. Jha, et al (4) conducted a study which shows 3% moderate AC reaction at postoperative 8 weeks. R. Venkatesh R et al (5) had 3.2%, Sudhakar et al (6) study had 4.2% with moderate anterior chamber reaction has compared to present study with 2.85%. Foreign body reaction is less, in the bag placed IOLs when compared to sulcus fixated IOLs (7). They concluded that single piece IOL is better than three piece IOL in uveitic patients.
LIMITATION: Hydrophobic acrylic, silicone IOLs are not compared with polymethyl methacrylate IOLs.
CONCLUSION: Single piece polymethyl methacrylate IOLs induces less postoperative anterior chamber reaction when compared to three piece IOLs.
(1.) Kanski J J. Chapter-14, Uveitis, Clinical Ophthalmology A Systematic Approach, sixth edition, Butterworth, Heinemann Elsevier Publication, 2007; pg-447.
(2.) Norman S. Jaffe, Mark S. Jaffe, Gary F. Jaffe, chapter 20, Uveitis Part II, Cataract Surgery And Its Complications, sixth edition, MOSBY, HARTCOURT ASIA Publication:pg-387-388.
(3.) Richard L. Lindstrom, MD Elizabeth A. Davis, MD, chapter-34, Polymethyl methacrylate Intraocular lenses, Cataract Surgery Technique Complications, and Management, part six, second edition, Roger F. Steinert, Saunders Publication, pg-395-404.
(4.) Lt Col KN Jha, Brig DP Vats, and Manual Small Incision Cataract Surgery; Experience at a Military Hospital; MJAFI.2006; 62: PG-212-215.
(5.) Venkatesh R, Muralikrishnan R, Balent L C, Prakash S K, Prajna N V, Outcomes of high volume cataract surgeries in a developing country, British Journal of Ophthalmology, 2005; 89:1079-1083.
(6.) Sudhakar J Ravindran RD, Natchiar G, Analysis of complications in 1000 cases of PC IOL Indian Journal of Ophthalmology, 1989; 37: pg-78-9.
(7.) Pande M. V, Spalton D. J, Kerr-Muir M.G, Marshall J. cellular reaction on anterior surface of Polymethylmethacrylate intraocular lenses, J Cataract Refract Surg; 1996; 22: pg-811-7.
Usha B. R , M. S. Usha 
[1.] Usha B. R.
[2.] M. S. Usha
PARTICULARS OF CONTRIBUTORS:
[1.] Lecturer, Department of Ophthalmology,Sri Devarajurs Medical Sciences, Tamaka.
[2.] Chief Ophthalmologist, Mysore Race Club Charitable Eye Hospital.
NAME ADDRESS EMAIL ID OF THE CORRESPONDING AUTHOR:
Dr. Usha B. R, # 50, Kaveri Main Road, Gururaja Layout, Mysore. Email: email@example.com
Date of Submission: 18/10/2014.
Date of Peer Review: 20/10/2014.
Date of Acceptance: 31/10/2014.
Date of Publishing: 05/11/2014.
|Printer friendly Cite/link Email Feedback|
|Title Annotation:||ORIGINAL ARTICLE|
|Author:||Usha, B.R.; Usha, M.S.|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Article Type:||Clinical report|
|Date:||Nov 6, 2014|
|Previous Article:||Effects and efficacy of 1st line and 2nd line art: A comparative study.|
|Next Article:||A rare case report of synchronous malignancy--squamous cell carcinoma of base of tongue and adeno carcinoma of stomach.|