MyMedR

Fulltext Intraocular lens implant

Sukumaran K

Med J Malaysia, 1983 Dec;38(4):272-4.

PMID: 6599981

Matched MeSH terms: Lenses, Intraocular*

Fulltext Anterior chamber implantation at University Hospital, Kuala Lumpur

Lim TK

Med J Malaysia, 1984 Sep;39(3):205-9.

PMID: 6544921

50 cases of anterior chamber intraocular lens implantation at the University Hospital, Kuala Lumpur were studied. 80% of the cases achieved visual acuity of 6/9 or better. The percentage would be higher if cases with pre-existing pathology are excluded and the period of follow-up is longer. Complications, mainly minor and non sight-threatening, are discussed.

Matched MeSH terms: Lenses, Intraocular*

Fulltext The use of ultrasound in ocular biometry

Kuan BB, Lim TK

Med J Malaysia, 1984 Dec;39(4):280-4.

PMID: 6544933

Ultrasound measurement of ocular dimension is the chosen method for assessing axial length when determining dioptric power for intraocular lens. From the current results of 30 cases studied, the mean axial length ranges from 22 to 23 mm. Despite the limitation of the accuracy of the ultrasonic measurements with the 7.5 mHz transducer, the power of intraocular lens can. be determined satisfactorily in accordance with the knowledge of keratometric reading. Hence, high refractive errors could be avoided post-operatively.

Matched MeSH terms: Lenses, Intraocular

Significance of intraocular lens power calculation

Singh M, Dahalan A

Br J Ophthalmol, 1987 Nov;71(11):850-3.

PMID: 3689737

A total of 94 patients underwent extracapsular cataract extraction and insertion of Sinsky style two-loop posterior chamber intraocular lenses. Forty-six eyes received a standard power IOL and 48 eyes were given a preoperatively calculated IOL. A significant difference was found in the two groups with regard to the postoperative refractive error and uncorrected visual acuity.

Matched MeSH terms: Lenses, Intraocular*

Implantation and diabetes: analysis of 525 cases

Lim AS, Ang BC, Heng LK, Hart PM, Ngui MS, Chew P, et al.

Ann Acad Med Singap, 1989 Mar;18(2):174-7.

PMID: 2751233

This is a retrospective study of 525 posterior chamber implants in diabetics performed by A S M Lim and B C Ang of Singapore. The patients were reviewed by visiting ophthalmologists--J E Kennedy (Sydney), M Ngui (East Malaysia) and P M Hart (Belfast). This study did not show any significant difference in the complication of post-operative visual acuity between diabetics and non-diabetics. 95% obtained 6/12 vision or better when pre-existing disease was excluded. It also showed that posterior chamber implants can be inserted in eyes with maculopathy or proliferative retinopathy if laser treatment was effectively done before or after surgery.

Matched MeSH terms: Lenses, Intraocular*

The effectiveness of sub-Tenon's infiltration of local anaesthesia for cataract surgery

Verghese I, Sivaraj R, Lai YK

Aust N Z J Ophthalmol, 1996 May;24(2):117-20.

PMID: 9199741

PURPOSE: To determine if adequate anesthesia and akinesia could be obtained using an inferonasal quadrant sub-Tenons anaesthesia for cataract surgery.
METHODS: The sub-Tenons method of local anaesthesia was used in 50 patients undergoing extracapsular cataract extraction and lens implantation. The technique following was that described by JD Stevens in his study of 50 patients. Posterior sub-Tenons space was approached through a conjunctival incision in the inferonasal quadrant and the anaesthetic solution delivered by an irrigating cannula. The patients were assessed for residual ocular movements just before surgery. Effectiveness of anaesthesia was assessed during surgery using a verbal pain rating score. Scoring was based on the concept of a visual analogue pain score chart.
RESULTS: Total akinesia was obtained in 20% patients and total anaesthesia in 24% patients. The remainder of the patients had adequate akinesia and anaesthesia to proceed with and complete the surgery.
CONCLUSION: This method provides satisfactory anaesthesia for cataract surgery.

Matched MeSH terms: Lenses, Intraocular

Effect of heparin-surface-modified poly(methyl methacrylate) intraocular lenses on the postoperative inflammation in an Asian population

Lai YK, Fan RF

J Cataract Refract Surg, 1996;22 Suppl 1:830-4.

PMID: 9279680

PURPOSE: To compare the efficacy of heparin-surface-modified (HSM), poly(methyl methacrylate) (PMMA) posterior chamber intraocular lenses (IOLs) with that of unmodified PMMA IOLs in reducing postoperative complications caused by inflammatory reactions after extracapsular cataract extraction in an Asian population.

SETTING: Departments of Ophthalmology, University of Malaya, Kuala Lumpur, Malaysia, and Tan Tock Seng Hospital, Singapore.

METHODS: In a randomized, double-blind study performed at two centers, 51 patients received an HSM PMMA lens and 48, an unmodified PMMA IOL. Cell and pigment deposits were evaluated by slitlamp at 1 to 6 days, 2 to 3 weeks, and 3 to 6 months postoperatively.

RESULTS: Significantly more eyes with unmodified IOLs had inflammatory cell deposits than those with HSM IOLs at 3 to 6 months (P < .001) and 12 to 14 months (P = .018) postoperatively. The HSM group also had significantly fewer cell deposits per patient at these two follow-ups. Significantly more eyes in the non-HSM group had pigment deposits 3 to 6 months after surgery (P = .049). One year postoperatively, about 85% of patients in both groups had a best corrected visual acuity of 0.5 or better.

CONCLUSION: Heparin surface modification significantly reduced the inflammatory response to PMMA IOLs in an Asian population for at least 12 to 14 months.

Matched MeSH terms: Lenses, Intraocular*

Fulltext Secondary intraocular lens implantation in University Hospital, Kuala Lumpur

Jaais F

Med J Malaysia, 1998 Sep;53(3):272-6.

PMID: 10968165

Secondary intraocular lens implantation after cataract surgery done in University Hospital between 1983 to 1993 were reviewed. Thirty three patients (37 eyes) underwent secondary intraocular lens implantation during this period. Twenty four eyes had secondary anterior chamber lens implantation while 13 had posterior chamber lens implantation. There was no case of secondary posterior scleral fixation lens implantation. Visual acuity of 6/9 or better was seen in 25 of 37 eyes (67%) in the series. Eyes seeing as good or better than before secondary implantation procedure were noted in 34 of 37 eyes (92%). Vision of 6/9 or better was seen in 9 of 13 eyes (70%) with posterior chamber implants and 16 of 24 eyes in (67%) with anterior chamber lenses. Complications including bullous keratopathy, uveitis and glaucoma were seen with anterior chamber implants of the rigid type resulting in poorer visual acuity than before the secondary procedure.

Matched MeSH terms: Lenses, Intraocular*

Fulltext Intraocular pressure variation following retrobulbar anaesthesia among the different sex, age and ethnic groups in Malaysia

Lee FN, Kong VY, Lee GP, Ho KH, Choon SC, Hoh HB

Med J Malaysia, 1999 Dec;54(4):438-41.

PMID: 11072460

A total of 114 patients (48 Chinese, 34 Malay and 32 Indian) undergoing extracapsular cataract extraction (ECCE) with intraocular lens implantation, were enrolled. All were given 3 ml of local anaesthetic (combination of equal amounts of lignocaine 2% and bupivacaine 0.5%) using retrobulbar technique. Intraocular pressure (IOP) was measured at different time intervals; before, immediately after and 5 minutes after injection with Honan balloon compression. Mean IOP increased by 5.0 mmHg immediately after injection (p < 0.001) and reduced to baseline level after 5 minutes of external compression. Although there were no statistical difference in terms of IOP variation between sex and age groups, Chinese patients demonstrated the highest IOP rise following retrobulbar anaesthesia. This is the first study to demonstrate the influence of race in the IOP response with Chinese subjects having the highest IOP rise.

Matched MeSH terms: Lenses, Intraocular*

Fulltext Crystal deposits in cornea from the use of vitamin C eye drops

Choong YY, Arumugam G

Med J Malaysia, 1999 Dec;54(4):526-7.

PMID: 11072476

There are a number of differential diagnoses for crystal deposits in the cornea. With the presence of a corneal epithelial defect, the differential diagnosis can be narrowed down to either infective causes or deposits from topical medications. This report describes a case of crystal deposits in the cornea from the use of Vitamin C eye drops.

Matched MeSH terms: Lenses, Intraocular

Fulltext Bilateral anterior chamber intraocular lenses dislocation in a patient with habitual eye rubbing

Poh EP, Fariza NN, Mariam I

Med J Malaysia, 2005 Aug;60(3):370-2.

PMID: 16379196

A 61-year-old Chinese man presented with bilateral posteriorly dislocated anterior chamber intraocular lenses (AC IOLs) one year after successful vitrectomy, removal of bilateral dislocated mature cataractous lenses and AC IOLs implantation. A thorough clinical evaluation revealed habitual eye rubbing as the only possible cause.

Matched MeSH terms: Lenses, Intraocular/adverse effects*

Fulltext Prediction error and accuracy of intraocular lens power calculation in pediatric patient comparing SRK II and Pediatric IOL Calculator

Jasman AA, Shaharuddin B, Noor RA, Ismail S, Ghani ZA, Embong Z

BMC Ophthalmol, 2010;10:20.

PMID: 20738840 DOI: 10.1186/1471-2415-10-20

Despite growing number of intraocular lens power calculation formulas, there is no evidence that these formulas have good predictive accuracy in pediatric, whose eyes are still undergoing rapid growth and refractive changes. This study is intended to compare the prediction error and the accuracy of predictability of intraocular lens power calculation in pediatric patients at 3 month post cataract surgery with primary implantation of an intraocular lens using SRK II versus Pediatric IOL Calculator for pediatric intraocular lens calculation. Pediatric IOL Calculator is a modification of SRK II using Holladay algorithm. This program attempts to predict the refraction of a pseudophakic child as he grows, using a Holladay algorithm model. This model is based on refraction measurements of pediatric aphakic eyes. Pediatric IOL Calculator uses computer software for intraocular lens calculation.

Matched MeSH terms: Lenses, Intraocular/standards*

Fulltext Intracameral injection of ranibizumab caused regression of iris neovascularisation and clearance of hyphaema in a non-diabetic patient with ischaemic remnant retinal flap in a silicone filled eye

Bastion ML

BMJ Case Rep, 2010;2010.

PMID: 22242074 DOI: 10.1136/bcr.10.2009.2398

The use of 0.5 mg/0.05 ml of ranibizumab intracamerally, to induce regression of iris neovascularisation in a non-diabetic patient, is reported. A 55-year-old Malay man presented with left eye rubeosis and hyphaema secondary to ischaemic remnant retinal flap in his silicone filled pseudophakic eye. Regression of rubeosis and resolution of hyphaema was noted within 4 days of injection of intracameral ranibizumab, allowing repeat vitrectomy to be performed without much bleeding, thus facilitating removal of his intraocular lens and laser to remaining flap. One month postoperatively he remained comfortable with counting fingers vision similar to the pre-hyphaema period.

Matched MeSH terms: Lenses, Intraocular

Fulltext Pseudophacocoele following blunt ocular trauma

Aziz S, Asokumaran T, Intan G

Med J Malaysia, 2011 Mar;66(1):64-5.

PMID: 23765148 MyJurnal

Blunt ocular trauma may result in expulsion of the intraocular lens in a patient who has undergone cataract surgery. This case report describes a patient who presented with an extrusion of intraocular lens following blunt ocular trauma post-operatively. The authors emphasise the importance of patient counselling and protection of the operated eye after surgery.

Matched MeSH terms: Lenses, Intraocular

Opacification of AcriFlex 50CSE hydrophilic acrylic intraocular lenses

Lim AK, Goh PP, Azura R, Mariam I

J Cataract Refract Surg, 2011 Apr;37(4):655-9.

PMID: 21420589 DOI: 10.1016/j.jcrs.2010.10.050

PURPOSE: To determine the prevalence of and risk factors for AcriFlex 50CSE hydrophilic acrylic intraocular lens (IOL) opacification approximately 3 years after implantation.
SETTING: Selayang Hospital, Selangor, Malaysia.
DESIGN: Cross-sectional study.
METHODS: Patients who had AcriFlex 50CSE IOL implantation in 2005 and 2006 were identified from operating logbooks and recalled via telephone and letters. Opaque IOLs were explanted and sent for scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS).
RESULTS: The review showed that 18 patients had died and 67 had declined examination or could not be contacted, leaving 239 eyes for evaluation. The age of the patients ranged from 25 to 85 years. Of the patients, 83 (34.7%) were Malay, 127 (53.1%) Chinese, and 29 (12.1%) East Indian. The male:female ratio was 1:1. Fourteen eyes of 13 patients (5.4%) had IOL opacification; 1 had bilateral opacification. Five eyes had fine deposits, and 9 eyes had dense opaque deposits. Seven opaque IOLs required explantation. There was no correlation between age (P=.645), sex (P=.319), or race (P=.860) and IOL opacification. Pearson chi-square analysis showed a strong association between diabetes mellitus and IOL opacification (P=.019). Nine (69.2%) of the 13 patients with opacification had diabetes. Scanning electron microscopy and EDS showed calcium and phosphate deposits on the optic surface and intralenticularly near the anterior surface of the optic.
CONCLUSIONS: Results indicate that diabetes mellitus is a risk factor for AcriFlex hydrophilic acrylic IOL opacification. In some cases, opacification affected vision, necessitating explantation. The pathophysiology of this complication is unknown.
FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

Matched MeSH terms: Lenses, Intraocular*

Fulltext Agreement analysis of LENSTAR with other techniques of biometry

Jasvinder S, Khang TF, Sarinder KK, Loo VP, Subrayan V

Eye (Lond), 2011 Jun;25(6):717-24.

PMID: 21394115 DOI: 10.1038/eye.2011.28

To assess the agreement of the optical low-coherence reflectometry (OLCR) device LENSTAR LS900 with partial coherence interferometry (PCI) device IOLMaster and applanation and immersion ultrasound biometry.

Matched MeSH terms: Lenses, Intraocular*

Fulltext Spontaneous dislocation of intraocular lens as a late complication of uncomplicated cataract surgery: a case series

Lam HH, Visvaraja S

Clin Exp Optom, 2012 Jan;95(1):99-102.

PMID: 21954950 DOI: 10.1111/j.1444-0938.2011.00640.x

Five patients having uncomplicated phacoemulsification were implanted with CT-Asphina 603P intraocular lenses into the capsular bag. After a few months, three of the patients had haptic flexion anterior to the optic despite minimal capsular fibrosis. One patient had spontaneous dislocation of the intraocular lens into the anterior chamber with only minimal capsular fibrosis. Another patient had one haptic dislocated out of the bag. Late intraocular lens dislocation is also seen in newly designed preloaded intraocular lenses despite the absence of significant capsular fibrosis. Haptic-optic junction design and intraocular lens material play important roles in such complication. A slightly large capsulorhexis might be a deterrent for implantation of this intraocular lens.

Matched MeSH terms: Lenses, Intraocular*

A systematic review of phacoemulsification cataract surgery in virtual reality simulators

Lam CK, Sundaraj K, Sulaiman MN

Medicina (Kaunas), 2013;49(1):1-8.

PMID: 23652710

The aim of this study was to review the capability of virtual reality simulators in the application of phacoemulsification cataract surgery training. Our review included the scientific publications on cataract surgery simulators that had been developed by different groups of researchers along with commercialized surgical training products, such as EYESI® and PhacoVision®. The review covers the simulation of the main cataract surgery procedures, i.e., corneal incision, capsulorrhexis, phacosculpting, and intraocular lens implantation in various virtual reality surgery simulators. Haptics realism and visual realism of the procedures are the main elements in imitating the actual surgical environment. The involvement of ophthalmology in research on virtual reality since the early 1990s has made a great impact on the development of surgical simulators. Most of the latest cataract surgery training systems are able to offer high fidelity in visual feedback and haptics feedback, but visual realism, such as the rotational movements of an eyeball with response to the force applied by surgical instruments, is still lacking in some of them. The assessment of the surgical tasks carried out on the simulators showed a significant difference in the performance before and after the training.

Matched MeSH terms: Lenses, Intraocular

Fulltext Sequelae of neglected senile cataract

Azhany Y, Hemalatha C, Nani D, Rosediani M, Liza-Sharmini A

Malays Fam Physician, 2013;8(1):33-7.

PMID: 25606266 MyJurnal

Cataract is the most common cause of blindness in the world. An attack of phacolytic and phacomorphic glaucoma as a result of neglected cataract constitutes a medical emergency that must be addressed immediately. Ocular emergencies such as these is challenging for the surgeon with guarded or poor prognosis. We describe the presentation, management and prognosis of three cases of phacomorphic and phacolytic glaucoma. All three patients underwent aggressive management of intraocular pressure. Despite successful cataract operation with implantation of intraocular lens, there was only mild improvement of the vision. Optic nerve and pupil functions were permanently affected following the insult. Phacomorphic and phacolytic glaucoma present a very challenging problem to the surgeon with poor visual outcome. Public health education and awareness are important and health workers should encourage patients with cataract to seek early treatment for better prognosis.

Matched MeSH terms: Lenses, Intraocular

Refractive outcomes comparison between the Lenstar LS 900® optical biometry and immersion A-scan ultrasound

Naicker P, Sundralingam S, Peyman M, Juana A, Mohamad NF, Win MM, et al.

Int Ophthalmol, 2015 Aug;35(4):459-66.

PMID: 25024102 DOI: 10.1007/s10792-014-9970-4

To determine the accuracy of intraocular lens (IOL) calculations in eyes undergoing phacoemulsification cataract surgery with IOL implantation using immersion A-scan ultrasound (US) and Lenstar LS 900(®) biometry. In this prospective study, 200 eyes of 200 patients were randomized to undergo either Lenstar LS 900(®) or immersion A-scan US biometry to determine the IOL dioptric power prior to phacoemulsification cataract surgery. Post-operative refractive outcomes of these two groups of patients were compared. The result showed no significant difference between the target spherical equivalent (SE) and the post-operative SE value by the Lenstar LS 900(®) (p value = 0.632) or immersion A-scan US biometry (p value = 0.438) devices. The magnitude of difference between the two biometric devices were not significantly different (p value = 0.868). There was no significant difference in the predicted post-operative refractive outcome between immersion A-scan US biometry and Lenstar LS 900(®). Based on the results, the immersion A-scan US technique is as accurate as Lenstar LS 900(®) in the hands of an experienced operator.

Matched MeSH terms: Lenses, Intraocular*

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