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   2002| July-September  | Volume 50 | Issue 3  
 
 
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OPHTHALMOLOGY PRACTICE
Preparation of amniotic membrane for ocular surface reconstruction
Hajib N Madhavan, K Priya, J Malathi, Patricia R Joseph
July-September 2002, 50(3):227-31
PMID:12355703
We describe the preparation and preservation of human amniotic membrane required for transplantation in the management of ocular surface diseases. Informed consent is obtained and the donor is screened to exclude risk of transmissible infections such as human immunodeficiency virus (HIV), hepatitis B virus, hepatitis C virus, and Treponema pallidum infections. Ideally, the media and washing solutions needed for the preparation of amniotic membrane are prepared only a week to 10 days prior to use and not stored in the freezer weeks ahead. The AM obtained under sterile conditions after elective caesarian section is washed free of blood clots and chorion. With the epithelial surface up, amniotic membrane is spread uniformly without folds or tears on individually sterilized 0.22 μm nitrocellulose membranes of the required sizes. The prepared filter membrane with the adherent amniotic membrane is placed in the preservative medium and stored at -80C. The membranes are released when the repeat serology for HIV after the window period has excluded virus infection in the donor. Depending on consumption they may be used up to 6 months after preparation, though many have recommended storage for an indefinite period. Since the amniotic membrane has only incomplete expression of HLA antigens and amniotic epithelial cells do not express them, it is not rejected after transplantation. The presence of several cytokines in the amniotic membrane promotes epithelialization with reduction of fibrosis during healing.
  13,124 2,689 10
CURRENT OPHTHALMOLOGY
Gene therapy in ocular diseases
Vijay K Singh, P Tripathi
July-September 2002, 50(3):173-181
PMID:12355690
Gene therapy is a novel form of drug delivery that enlists the synthetic machinery of the patient's cells to produce a therapeutic agent. Genes may be delivered into cells in vitro or in vivo utilising viral or non-viral vectors. Recent technical advances have led to the demonstration of the molecular basis of various ocular diseases. Ocular disorders with the greatest potential for benefit of gene therapy include hereditary diseases such as retinitis pigmentosa, tumours such as retinoblastoma or melanoma, and acquired proliferative and neovascular retinal disorders. Gene transfer into ocular tissues has been demonstrated with growing functional success and may develop into a new therapeutic tool for clinical ophthalmology in future.
  9,041 1,006 5
COMMUNITY EYE CARE
Fear of blindness and perceptions about blind people. The Andhra Pradesh eye disease study
P Giridhar, R Dandona, Mudigonda N Prasad, V Kovai, L Dandona
July-September 2002, 50(3):239-46
PMID:12355705
  8,029 352 1
ORIGINAL ARTICLE
Enhancing eye donation rates. Training students to be motivators
U Dhaliwal
July-September 2002, 50(3):209-212
PMID:12355696
Purpose: Medical professionals could enhance eye donation rates by reminding relatives during grief counseling at the time of patient's death. This study was designed to assess the knowledge and attitudes of final year medical students (future doctors) towards eye donation, prior to instruction in eye banking. Methods: The responses of 49 final-year medical students to a questionnaire on eye donation were compared with 24 non-medical students (controls). The results were analysed statistically using the chi-square test. Results: More than one-third of students and controls were unaware that eyes are removed within six hours of death. Eight (16.3%) students and 6 (25.0%) controls felt that a close relative's eyes could be donated after death only if he had indicated willingness (P=0.05). Three (6.1%) students and 3 (12.5%) controls were undecided about donating their own eyes. Nineteen (38.8%) students and 6 (25%) controls did not know where to go in order to pledge/donate eyes. The controls had poorer knowledge of ocular and systemic contraindications, and they did not know that storage could be prolonged (P<0.001). Only 27 (55.1%) students had knowledge of corneal storage. Conclusions: Controls were poorly informed about various aspects of eye donation suggesting inadequate dissemination of information by the media. Students and controls alike had misconceptions regarding donation of relatives' eyes and hesitation regarding their own. These aspects should be emphasized during undergraduate teaching to dispel misgivings regarding wastage of donor eyes and to encourage future doctors to promote eye donation.
  7,689 404 5
Macular serpiginous choroiditis
Dinesh K Sahu, A Rawoof, B Sujatha
July-September 2002, 50(3):189-196
PMID:12355692
Purpose: To report a variant form of serpiginous choroiditis, that initially or predominantly involved the macular area. Methods: Nine eyes of 6 patients with the macular form of serpiginous choroiditis were evaluated clinically and angiographically in a longitudinal fashion for a period of 12-36 months. The active stage and the recurrences were treated by oral and periocular cortico steroids; and two patients were supplemented with oral azathioprine. Most of these patients were referred to our center with varied diagnoses. Results: In this group, 4 were male and 2 were female with an average age of 30.5 years. Three patients had bilateral macular lesions, two had typical serpiginous choroiditis in the fellow eye and the remaining one had unilateral macular involvement alone. The initial visual acuity was 6/60 or less in 60% eyes whereas the final visual acuity was 6/18 or better in 66% eyes. Angiographic findings were typical of serpiginous choroiditis characterised by early hypofluorescence followed by leakage and staining of the borders and the lesion itself without any evidence of choroidal ischaemia or retinal vascular abnormalities. Conclusion: The macular variant of serpiginous choroiditis can mimic many other macular pathologic lesions, thus posing a diagnostic dilemma. Because of its relentless destructive course, early diagnosis and prompt treatment is required to prevent sight-threatening complications.
  7,220 464 5
Peribulbar anaesthesia using a combination of lidocaine, bupivocaine and clonidine in vitreoretinal surgery
E Calenda, Jean Claude Quintyn, G Brasseur
July-September 2002, 50(3):205-208
PMID:12355695
Purpose: The efficacy and safety of peribulbar anaesthesia was assessed using a combination of lidocaine, bupivacaine and clonidine during eye surgery. Methods: We prospectively studied 100 vitreo-retinal surgical procedures performed by several surgeons. The exclusion criteria included age below 30 years and, axial length of the orbit above 28 mm. Peribulbar was performed using Hamilton's technique. A mixed anaesthetic solution of equal quantity of lidocaine 2% and bupivacaine 0.5% with clonidine (1mg/kg) was injected. Patients received a mean volume of 14.5 ml 3.5 of the mixture. Akinesia and analgesia were assessed 15 minutes later by the surgeon. Whenever required, supplemental lidocaine 2% (3 ml) by sub- Tenon infiltration was added by the surgeon. Supplemental injections were given only to patients who failed to develop analgesia. Results: The mean age of patients (male 52%, female 48%) was 66 years 10 (mean SD, range 44-90). The 100 surgical procedures were made up of vitrectomy gas silicone oil (22/100), vitrectomy and lensectomy (6/100), vitrectomy and epiretinal membrane laser coagulation gas silicone oil (35/100), scleral buckling or encircling gas (36/100), and cryosurgery gas (1/100). Analgesia was adequate throughout surgery without any supplementation in 85% of cases and with a sub-Tenon infiltration in 99%. Akinesia was complete in 84%, mild in 12% and absent in 4% of cases. The sub-Tenon injection was performed in 15% of cases. Three patients (3%) were agitated during surgery. No neurologic or cardiac complication was seen. In one patient, the systolic blood pressure decreased from 170 to 110 mmHg, 30 minutes after the institution of the peribulbar block. Conclusion: Our results show that peribulbar anaesthesia in the proposed mixture offers excellent analgesia in 85% of patients, and in 99% of the patients when supplemented by a subtenon injection. The current mixture of lidocaine, bupivacaine and clonidine is an excellent alternative to the previously used mixture etidocaine, bupivacaine and hyaluronidase for vitreoretinal surgery. However, a randomized controlled clinical trial is needed to prove the efficacy and safety of these results.
  6,221 404 1
RESEARCH METHODOLOGY
Population-based screening versus case detection.
R Thomas, R Parikh, P Paul, J Muliyil
July-September 2002, 50(3):233-7
PMID:12355704
India has a large burden of blindness and population-based screening is a strategy commonly employed to detect disease and prevent morbidity. However, not all diseases are amenable to screening. This communication examines the issue of "population-based screening" versus "case detection" in the Indian scenario. Using the example of glaucoma, it demonstrates that given the poor infrastructure, for a "rare" disease, case detection is more effective than population-based screening.
  4,899 409 8
ORIGINAL ARTICLE
Intraocular osseous metaplasia. A clinico-pathological study
Geeta K Vemuganti, Santosh G Honavar, S Jalali
July-September 2002, 50(3):183-188
PMID:12355691
Purpose: To evaluate the clinico-pathologic features of intraocular osseous metaplasia. Methods: Pathology specimens of enucleated eyes submitted to the ophthalmic pathology service at a tertiary eye-care referral center between January 1995 and June 1999 were studied for intraocular osseous metaplasia. Specific histopathologic features noted in specimens with osseous metaplasia were the presence of retinal detachment, gliosis, retinal pigment epithelial hyperplasia, drusen, epiretinal membrane, fibrovascular proliferation and inflammation. Immunohistochemistry using monoclonal antibody against glial fibrillary acidic protein was performed to assess the glial component within the membranes and the proliferative vitreoretinal mass. Clinical records were reviewed and correlated with histopathologic findings. Results: Osseous metaplasiaS was noted in 8 of 151 (5.2%) eyes examined. Clinical diagnosis in these was phthisis bulbi, staphyloma, absolute glaucoma and microphthalmos. Enucleation was performed for relief of symptoms (in painful blind eyes) or for cosmesis, and in an eye inciting sympathetic ophthalmia. Retinal detachment, gliosis and retinal pigment epithelial hyperplasia were noted in all the cases. Drusen with calcification or ossification (5 of 8), fibrovascular proliferation in the vitreous (5 of 8) and active inflammation (4 of 8) were the other associated histologic features. Location of ossification was subretinal in 3 cases, preretinal (ora serrata) in 1 case and in both locations in 4 cases. The eyes with subretinal osseous metaplasia had associated calcified drusen, while preretinal ossification was seen within the fibrovascular membranes. Conclusion: Chronic retinal detachment, hyperplasia and transdifferentiation of retinal pigment epithelium appear to be a few of the prerequisites for intraocular osseous metaplasia. Ossification can occur at isolated subretinal and preretinal locations or can involve both. Though a larger study is required to postulate the chronology of events, in this small series, isolated subretinal ossification appears to be initiated by calcification and ossification of drusen, while in the pre-retinal region it is associated with vitreoretinal proliferation.
  4,715 329 5
BRIEF REPORTS
Penicillium keratitis in vernal Keratoconjunctivitis.
R Arora, S Gupta, Usha K Raina, Dinesh K Mehta, M Taneja
July-September 2002, 50(3):215-216
PMID:12355698
We report a case of penicillium keratitis in vernal shield ulcer in the absence of corticosteroid use. This report illustrates super-added infection in vernal shield ulcer by an organism which is otherwise innocuous and forms a part of the normal ocular flora.
  4,770 244 3
Bilateral renal artery stenosis presenting as hypertensive retinopathy and choroidopathy.
Sumeet K Malhotra, R Gupta, S Sood, L Kaur, S Kochhar
July-September 2002, 50(3):221-223
PMID:12355701
This report describes a rare case of hypertensive retinopathy with choroidopathy secondary to bilateral renal artery stenosis in a young non-pregnant female patient.
  4,610 241 1
Angle closure glaucoma following pupillary block in an aphakic perfluoropropane gas-filled eye
A Kumar, S Kedar, Vinay K Garodia, Rajinder P Singh
July-September 2002, 50(3):220-221
PMID:12355700
We report the case of a 35-year-old aphakic patient who developed an intractable secondary glaucoma due to angle closure after pupillary block following the use of perfluoropropane (C3F8) gas at a nonexpansile concentration of 14%.
  4,264 212 1
ORIGINAL ARTICLE
Age-related changes in the macula. A histopathological study of fifty Indian donor eyes
J Biswas, R Raman
July-September 2002, 50(3):201-204
PMID:12355694
PURPOSE: Age-related macular degeneration (ARMD) is clinically less common in India compared to the West. Therefore, clinicians are unfamiliar with histopathologic evidence of age-related macular changes in the Indian population. METHODS: Fifty consecutive human donor eyes removed for corneal grafting were studied for gross, microscopic and histochemical features of age-related changes in the macula in the Indian population. A horizontal block was cut from the globe including the optic disc, and the macula. Six sections, 6 microns thick, were cut from three levels in the macula at a distance of 140 microns. These were stained with haemotoxylin-eosin, periodic acid-Schiff, Mallory, Masson trichrome, alcian blue and von Kossa stains. The presence of basal laminar deposits, drusen and thickening and calcification of Bruch's membrane in the macula were assessed at 400 x magnification using a modified version of Sark's classification. RESULTS: Twenty-four donor eyes (48%) had some form of age-related macular change. These included basal laminar deposits, hard drusen, soft drusen, extensive retinal pigment epithelium atrophy of the macula, and disciform degeneration of macula. A combination of changes was often seen. Age-related changes were more common in the seventh and eighth decade. CONCLUSION: Our study shows that histological changes characteristic of the early stages of age-related macular degeneration are fairly common in the Indian population. However, advanced macular changes are significantly rare.
  4,080 259 1
BRIEF REPORTS
An unusual case of late ocular changes after lightning injury.
H Datta, K Sarkar, Pradeep R Chatterjee, S Datta, U Mukherjee
July-September 2002, 50(3):224-225
PMID:12355702
We describe a case of late ocular changes after lightning injury. One year after the injury, complete ankyloblepharon, severe dry eye, corneal opacity, healed iritis and mature cataracts were noted in both eyes of the patient.
  3,935 228 2
The indocyanine green findings in idiopathic uveal effusion syndrome
A Kumar, S Kedar, Rajinder P Singh
July-September 2002, 50(3):217-219
PMID:12355699
We report two cases clinically diagnosed as idiopathic uveal effusion syndrome, where indocyanine green angiogram suggest non-specific choroidal inflammation as the underlying cause. Treatment with non-steroidal anti-inflammatory drugs was beneficial.
  3,902 258 2
EDITORIAL
Amniotic membrane transplantation
Virender S Sangwan
July-September 2002, 50(3):169-170
PMID:12355689
  3,617 383 -
BRIEF REPORTS
Simultaneous bilateral fungal keratitis caused by different fungi.
N Venkatesh Prajna, Rema A Rao, Minu M Mathen, L Prajna, C George, M Srinivasan
July-September 2002, 50(3):213-214
PMID:12355697
Fungal keratitis is an important cause of corneal disease in the tropical world. We report a rare presentation of simultaneous bilateral corneal ulceration caused by different fungi.
  3,552 237 6
ORIGINAL ARTICLE
Intracameral lidocaine in trabeculectomy. A preliminary safety and efficacy study
Jimmy S Lai, Clement C Tham, Dennis S Lam
July-September 2002, 50(3):197-200
PMID:12355693
Purpose: To study the safety and efficacy of intracameral lidocaine as anaesthesia in trabeculectomy for primary open-angle glaucoma. Methods: Trabeculectomy under intracameral anaesthesia using 1% preservative-free lidocaine was performed in 10 patients with primary open-angle glaucoma. Intraoperative pain score, postoperative intraocular pressure (IOP) and endothelial cell count at 3 months were recorded. Results: The mean pain score was 1.70 1.34. The mean IOP was lowered from 24.60 8.28 mmHg preoperatively to 14.1 3.11 mm Hg postoperatively. There was no significant decrease in the mean endothelial cell count 3 months after the surgery (P = 0.375). Conclusion: Intracameral lidocaine may be a safe and effective alternative anaesthesia method in trabeculectomy for uncomplicated primary open-angle glaucoma.
  3,350 178 -
LETTER TO EDITOR
Combined extracapsular cataract extraction with Ahmed glaucoma valve implantation in phacomorphic glaucoma
Harinder S Sethi, Harminder K Rai, Vijay B Wagh, M Narvekar
July-September 2002, 50(3):247-8
PMID:12355708
  2,743 179 -
Acute retinal necrosis and HIV
N Mukerji, Mayank S Pangtey, S Khokhar
July-September 2002, 50(3):251-2
PMID:12355711
  2,703 169 -
Population-based Study of spectacles use in Southern India
NS Jayanand
July-September 2002, 50(3):250-1
PMID:12355710
  2,596 168 1
Childhood proptosis. The invaluable but overlooked peripheral blood smear.
A Panda, R Sudan, S Nainiwal
July-September 2002, 50(3):247-247
PMID:12355707
  2,390 163 -
Endo-light pipe to localise the site of SRF drainage in retinal reattachment surgery with hazy ocular media.
A Kumar, G Prakash, P Garg
July-September 2002, 50(3):247-247
PMID:12355706
  2,419 113 -
Effect of combination antiretroviral therapy on cytomegalovirus retinitis
Yogendra G Vabale
July-September 2002, 50(3):249-50
PMID:12355709
  1,960 160 -