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  1. Thevi T, Sahoo S
    Med J Malaysia, 2016 Apr;71(2):45-6.
    PMID: 27326939
    PURPOSE: To analyse the visual outcomes of cases with posterior capsule rupture (PCR) compared to those without PCR following phacoemulsification. The occurrence of posterior capsule rupture during phacoemulsification surgery for cataract can have serious implications in the visual recovery. However, recognition of PCR and proper management can yield a successful visual outcome. This study analysed the visual outcomes of cases with PCR compared to those without PCR.

    METHODS: This is a case-control study. All patients who underwent cataract surgery from 2011 to 2012 in Hospital Melaka were traced from the National Eye Database (NED) of Malaysia. The visual outcomes were classified as good, borderline and poor as per WHO guidelines. The data was analysed with SPSS version 12 IBM.

    RESULTS: Out of 80.4% (2519) of eyes that had undergone phacoemulsification (PHACO) type of surgery, 3.06% (77 cases) had posterior capsule rupture complication. There was no significant difference in the visual outcome of borderline between cases with PCR and cases without PCR (Odds Ratio (OR) 0.989; 95% Confidence Interval (CI) 0.382- 2.560). However, cases with PCR were significantly less likely to have good vision compared to those without PCR (OR 0.335; 95% CI 0.157-0.714).

    CONCLUSION: The study reveals that a significant number of patients without PCR had good vision, whereas those with PCR did not get good vision. We would like to suggest meticulous care during phacoemulsification surgery to avoid PCR in order to obtain good visual outcomes.
  2. Thevi T, Abas AL
    Kathmandu Univ Med J (KUMJ), 2019 4 1;17(66):101-106.
    PMID: 32632055
    Background Since cataract is the leading cause of blindness and no study has been done on the surgical incidence trends, we conducted this research in Melaka. Objective To describe incidences of cataract surgery according to basic demographic variables and types of surgery performed. Method Using the National Eye Database (NED), we performed descriptive statistics calculating incidence rates per 1,000 population by demographic features and types of cataract operations to look at the trends of surgeries in the population. Statistics for population were obtained from the department of statistics. Result From 2007-2010, 6270 patients mostly 60-69 years underwent cataract surgery. Phacoemulsification (78.2%) was the commonest surgery performed. The annual incidence rate of cataract surgery reduced from 2.05 per 1000 population in 2007 to 2.02 per 1000 population in 2010 (p<0.05). Incidence rates for those aged 60 and above rose while for those aged below nine years it declined. Indians had the highest incidence rates followed by Chinese and Malays per 1000 population. Females had a higher incidence rate although there was a declining trend over the years. Conclusion Cataract surgery rates showed a decline. Public health education and awareness on detection and operating upon cataracts should be increased and especially targeted towards vulnerable groups such as women, individuals of Indian ethnicity and those aged 50 years and above.
  3. Thevi T, Abas AL
    Kathmandu Univ Med J (KUMJ), 2021 2 18;18(70):122-132.
    PMID: 33594017
    Background Cataract surgery which is the only scientific method to treat cataracts has evolved from large incisions of intracapsular cataract excision to extracapsular cataract exicison and now modern day phacoemulsification. Anaesthesia too has progressed from general anaesthesia to local and topical anaesthesia. A variety of intraocular lenses are available ranging from rigid to foldable, multifocal and toric. Day care surgeries are becoming the norm these days. Objective Cataract surgery has advanced with new techniques and modalities. We studied the trends of cataract surgery and outcomes over the years. Method We performed secondary data analysis (National Eye Database) of cataract surgery patients in Hospital Melaka (2007 - 2014). Result Most patients were 60-69 years (mean 65.0 years). Primary cataract rose (p<0.05) but there was no difference in laterality and first or second eye (p>0.05). More patients presented with Hypertension and Diabetes (p<0.05). Pterygium encroaching the cornea showed a rise (p<0.05). Phacoemulsification (80.8%) showed a rise while Extracapsular Cataract Extraction (ECCE) (15.4%) declined (p<0.05). More Specialists operated and fewer combined surgeries were performed (p<0.001). Type of anaesthesia did not change (p>0.05). Operative complications reduced (p<0.001). Anterior chamber, scleral fixated and foldable intraocular lenses usage reduced (p<0.05). There was no change in pre-operative visual acuity (p>0.05) but postoperative vision showed a rise in good outcomes (p<0.05). Conclusion Melaka Hospital shows a rise in phacoemulsification and a decline in Extracapsular Cataract Extraction. More patients presented with primary cataracts. More Specialists operated and there was a reduction in intraoperative and postoperative complications. Post-operative visual outcomes showed a remarkable improvement. This improvement is in keeping with the aim of improved vision for all by 2020.
  4. Thevi T, Abas AL
    Kathmandu Univ Med J (KUMJ), 2021 6 25;18(72):414-419.
    PMID: 34165102
    Bauxite is an ore from which Aluminium is produced. Malaysia, once the leading producer of bauxite has reduced production as mining activity has caused community outrage. Due to concerns about health concerns, rising pollution and environmental hazards, the government has revoked the licenses of bauxite miners. We therefore did a meta-analysis to assess the relationship between exposure to Bauxite and Alumina with incidence of various types of cancers. Bauxite mines and alumina refineries. Individuals of all ages exposed to Bauxite and Alumina. Exposure to bauxite and alumina. Incidence due to overall cancers and specific types of cancers. Exposure to bauxite and alumina did not cause variations in incidence of overall cancer and specific types of cancer such as cancer of lip, cancer of the oral cavity and pharynx, cancer of digestive organs and others. We conclude that there is no evidence that bauxite or alumina exposure cause increase incidence of cancer but due to the small number of studies included in this review, we recommend more cohort studies to be done in future.
  5. Thevi T, Abas AL
    Oman J Ophthalmol, 2018 6 23;11(2):113-118.
    PMID: 29930443 DOI: 10.4103/ojo.OJO_220_2016
    BACKGROUND: Cataract surgery is associated with a variety of complications, one of which is vitreous loss. Doctors and policymakers should be aware about the precipitating factors, associations, and expected outcomes of vitreous loss. This study was, therefore, undertaken to set guidelines to improve the visual outcomes of patients.

    MATERIALS AND METHODS: A retrospective 8-year analysis was conducted from 2007 to 2014 using the national eye database. Demographic features, ocular comorbidities, grade of surgeon, type of surgery, and the associations with the occurrence of vitreous loss, and the final visual outcomes of these patients were studied.

    RESULTS: Out of 12,992 eyes, only 3.2% had vitreous loss, mostly aged <40 years. Pseudoexfoliation was the only ocular comorbidity causing vitreous loss. Medical Officers and Gazetting Specialists got more vitreous loss compared to specialists. Intracapsular cataract extraction, phaco convert to extracapsular cataract extraction (ECCE), ECCE, and phaco all had a significant vitreous loss. Vitreous loss was the most significant intraoperative complication causing poor vision and resulted in impaired or poor visual outcome.

    CONCLUSION: Vitreous loss occurred in almost all types of cataract surgeries, especially by junior surgeons, among those aged <40 years and significantly caused poor visual outcome compared to other complications. Pseudoexfoliation had higher occurrence of vitreous loss. Vitreous loss patients had impaired/poor visual outcome due to preexisting comorbidity and astigmatism. Patients at risk and junior surgeons should be closely monitored to improve outcomes. Further studies need to be done to see why and when the vitreous loss occurred.
  6. Thevi T, Reddy SC
    MyJurnal
    Ocular injuries or trauma to the eye can be caused by variety of objects resulting in a spectrum of lesions in the eye. We did a Pubmed/Google/Science Direct search to review the spectrum of ocular injuries in Malaysia. In our review, we included 28 papers providing information on ocular injuries which were published from Malaysia during the period 1991-2016 in different medical journals. Prevalence was more among males with an average age of 35 years. Among adults they were more common in the workplace but in children it occurred at home. Few wore protective glasses at work. The mode of injury was due to sharp objects hitting the eye, motor vehicle and domestic accidents, firecrackers, chemicals and rarer causes like superglue and durian fruit. Prognostic factors for outcome were the initial visual acuity, length of the wound, associated factors like hyphaema, intraocular foreign body and vitreous prolapse. Missing the diagnosis of perforation of the eyeball is possible without eliciting a proper history. Protective devices must be worn to prevent injuries. Display of health education charts showing the effect of injuries in the eye and their preventive measures in health centres, private hospitals, schools, factories and sports centres will increase the awareness of public about the ocular injuries. It is important to diagnose the tissues involved in ocular trauma by the general practitioners and primary care physicians and refer the patients to the Ophthalmologist urgently for treatment to salvage vision. Compensation mechanisms should then be put forth in terms of rehabilitation and for monetary loss.
  7. Thevi T, Abas AL
    Oman J Ophthalmol, 2019 10 11;12(3):160-165.
    PMID: 31902990 DOI: 10.4103/ojo.OJO_238_2018
    INTRODUCTION: Pseudoexfoliation (PXM) is a fibrillar material deposited in the anterior chamber of the eye and can cause disintegration of zonules and make pupillary dilatation difficult. This can make surgery difficult and result in intraoperative and postoperative complications. The aim of this study was to learn about whether the presence of pseudoexfoliation caused significant complications during cataract surgery.

    MATERIALS AND METHODS: We did a secondary data analysis of 12,992 eyes from 2007 to 2014 using the National Eye Database of Melaka Hospital Malaysia on intraoperative and postoperative cataract surgery complications of patients with PXM.

    RESULTS: Patients with PXM were 2.68 times more likely to get intraoperative complications (P < 0.001). They had a higher incidence of lens subluxation, zonular dehiscence, and vitreous loss (P < 0.001). Although posterior capsule rupture (PCR) was the most common intraoperative complication during cataract surgery (4.8%), the presence of pseudoexfoliation was not associated with PCR (P > 0.05). We did not observe any association between patients with pseudoexfoliation and any of the postoperative complications such as corneal decompensation, raised intraocular pressure, and intraocular lens decentration (P > 0.05). Pseudoexfoliation did not cause corneal decompensation (P > 0.05) although corneal decompensation was the highest postoperative complication of cataract surgeries (0.18%).

    CONCLUSIONS: Patients with PXM had a higher rate of intraoperative complications which were mainly vitreous loss and zonular dehiscence and also lens subluxation/dislocation. We observed poorer visual outcomes in those with PXM following cataract surgery. Patients with pseudoexfoliation should be identified and precautions taken to minimize these complications to get better visual outcomes.

  8. Thevi T, Abas AL
    Indian J Ophthalmol, 2017 Oct;65(10):920-925.
    PMID: 29044054 DOI: 10.4103/ijo.IJO_512_17
    Traumatic endophthalmitis is a devastating condition that can occur following an open globe injury and result in loss of vision. The use of prophylactic antibiotics is empirical as most surgeons fear complications associated with the same. No systematic review has been performed in English on the role of intravitreal/intracameral antibiotics in preventing traumatic endophthalmitis. We searched for randomized controlled trials and controlled clinical trials comparing intracameral/intravitreal antibiotics with placebos on PubMed, Google Scholar, Science Direct, and Cochrane Library using keywords open globe/trauma/penetrating/perforating injuries endophthalmitis. The last search was on 5 May 2017. We included patients of all ages with open globe injuries who received intracameral/intravitreal antibiotics, regardless of the dose. Quality of the trials was assessed using Cochrane collaboration tools to assess the risk of bias. The main outcome measures were endophthalmitis and visual acuity. We included three trials. Overall, intravitreal/intracameral antibiotics were noted to significantly reduce the occurrence of endophthalmitis in open globe injuries (relative risk [RR] 0.19, 95% confidence interval [CI] 0.06-0.57). The use of intravitreal/intracameral antibiotics did not have an effect in improving visual acuity (RR 1.17, 95% CI 0.61-2.23). Two trials (Narang 2003; Soheilan 2001) were observed to have no significant effect on visual acuity while another trial (Soheilan 2007) did not list visual acuity as part of its objectives. Intracameral/intravitreal antibiotics reduce the risk of endophthalmitis in open globe injuries; although, there was no improvement in the visual acuity. We, therefore, recommend the use of intravitreal/intracameral injections in open globe injuries to prevent this devastating complication.
  9. Thevi T, Godinho MA
    Br J Ophthalmol, 2016 Dec;100(12):1708-1713.
    PMID: 26994109 DOI: 10.1136/bjophthalmol-2015-307785
    BACKGROUND: Cataract surgery has progressed from large incision to smaller incisions, which do not require sutures. Anaesthesia too has progressed from general anaesthesia to local anaesthesia to topical anaesthesia. The ideal anaesthesia for cataract surgery would be one that is easy to administer, provides adequate pain relief during surgery and is associated with fewer complications.

    AIMS: This study was done to find out the most suitable anaesthesia for patients with fewer complications and also to look at the trend of anaesthesia being used.

    METHODS: A retrospective analysis was done of patients who underwent cataract surgery from 2007 to 2014 in Hospital Melaka. Data were obtained from the National Eye Database and analysed using SPSS. Trend of types of anaesthesia used and the associated complications with each were studied.

    RESULTS: The most frequently used anaesthesia was topical anaesthesia, which showed an upward trend followed by subtenon in turn showing a downward trend. Subtenon anaesthesia was associated with more intraoperative and postoperative complications while topical anaesthesia was associated with fewer complications.

    CONCLUSIONS: Topical anaesthesia has shown a steady increase in usage and is the ideal anaesthesia, which has been associated with fewer complications.

  10. Thevi T, Godinho MA
    Int J Ophthalmol, 2017;10(9):1452-1459.
    PMID: 28944207 DOI: 10.18240/ijo.2017.09.19
    AIM: To explore the associations between various characteristics of Malaysian cataract patients and their management, and their post-operative visual outcomes, to inform relevant bodies to reduce cataract-related blindness.

    METHODS: We conducted a descriptive secondary data analysis of cataract surgery patients in Melaka Hospital, from 2007 to 2014 using the National Eye Database (NED). Patient-related factors (demographic features, systemic and ocular comorbidities) and management-related factors (surgical duration, type of surgery, type of lens) were analysed for their association with visual outcome (acuity).

    RESULTS: Most patients were Malays (48.23%) and Chinese (38.55%) aged 60-79y (range 0-100y). Hypertension (58.61%) and diabetes (44.89%) were major systemic comorbidities. Glaucoma (6.71%) and diabetic retinopathy (10.12%) were the main ocular comorbidities. Other comorbidities were age-related macular degeneration, pterygium, corneal opacities, macula diseases, vitreous haemorrhage, retinal detachment and pseudoexfoliation (0.70%-1.60%). Preoperatively 7150 (55.03%) eyes presented with poor vision. Uncomplicated phacoemulsification performed quickly with foldable lenses gave good results.

    CONCLUSION: Primary care physicians should initiate early detection to prevent late presentation of cataracts causing poor vision and should discuss the risks and benefits of cataract surgery while emphasizing the role of pre-existing comorbidities which may affect the visual outcomes. For good results, phacoemulsification should be done within 30min, without complications, using foldable posterior chamber intraocular lens.
  11. Thevi T, Mimiwati Z, Reddy SC
    Nepal J Ophthalmol, 2012;4(2):263-70.
    PMID: 22864032 DOI: http://dx.doi.org/10.3126/nepjoph.v4i2.6542
    To determine the factors affecting the visual outcome in patients with open globe injuries of eye.
  12. Thevi T, Reddy SC, Shantakumar C
    Malays Fam Physician, 2014;9(2):41-7.
    PMID: 25883764 MyJurnal
    The aim of the study was to compare the outcomes of phacoemulsification (Phaco) and extracapsular cataract extraction (ECCE) in a district hospital setting.
  13. Thevi T, Maslina B, Reddy SC
    Malays Fam Physician, 2012;7(1):6-10.
    PMID: 25606238
    Objective: To determine the prevalence of eye diseases and visual impairment among new patients at the eye clinic of Hospital Sultan Haji Ahmad Shah, Temerloh, Pahang.
    Method: In this cross-sectional prospective study, 1081 new patients were examined over a period of six months. Age, gender, ethnicity, visual acuity and diagnosis were noted from the medical records.
    Results: Out of 1081 examined, 607 (56.1%) were males, 783 (72.4%) were Malays. The mean age of patients was 45.2 years (ranging from one month to 91 years). Cataract (248, 22.9%) was the most common eye disease, followed by retinal diseases (124, 11.5%) and ocular trauma (106, 9.8%). Majority of the patients (48) suffering from ocular trauma had foreign body cornea. In 85 premature infants screened for retinopathy, 19 showed different stages of retinopathy of prematurity. Visual impairment was noted in 89 (8.2%) patients, severe visual impairment in 12 (1.1%) and blindness in 35 (3.2%); vision could not be determined in 85 premature infants (7.9%). Cataract was singled out as the cause of severe visual impairment in 11 out of 12 patients.
    Conclusion: Health education at primary health centres and availability of eye specialists in all the district hospitals will facilitate the rehabilitation of visually impaired and blind persons by providing early treatment for eye problems (specifically prescription for spectacles, medical treatment and cataract surgery with intraocular lens implantation).
    Keywords: Visual impairment, cataract, diabetic retinopathy, glaucoma, refractive errors, ocular trauma, conjunctivitis
    Study site: Eye clinic, Hospital Sultan Haji Ahmad Shah, Temerloh, Pahang, Malaysia
  14. Thevi T, Maizura Z, Abas AL
    Indian J Ophthalmol, 2017 Jan;65(1):24-29.
    PMID: 28300736 DOI: 10.4103/ijo.IJO_452_16
    INTRODUCTION: As in all surgeries, complications during cataract surgery are unavoidable and cause distress to the surgeon and the patient. This study was conducted to know the factors contributing to complications in our settings, to be able to counsel patients about complications and outcomes and to reduce litigations.

    MATERIALS AND METHODS: The secondary data analysis was conducted using the National Eye Database from 2007 to 2014. Demographic features, ocular comorbidities, technique of surgery, grade of surgeons, types of intraoperative complications, and reasons for not obtaining good visual acuity following intraoperative complications were studied. Statistics was done using Statistical Package for Social Sciences version 20.

    RESULTS: Out of 12,992 eyes, 6.1% had intraoperative complications. The highest rate of complications was when more trainees (medical officers [MOs] and gazetting specialists) operated. Posterior capsule rupture (PCR) was the most common complication followed by vitreous loss and zonular dehiscence. Those aged below 40 years had more complications (P < 0.05), and females had more complications. Ethnicity did not affect complications. Pseudoexfoliation was the only comorbidity causing complications (P < 0.05). Phacolytic lenses had 8.118 times the odds of getting intraoperative complications. MOs and gazetting specialists got more complications. Good outcomes were obtained in cases without complications and those operated by specialists. High astigmatism was the main reason for poorer outcomes.

    CONCLUSION: Intraoperative complications were caused mostly by less experienced doctors and had poorer outcomes. Age below 40 years, females, the presence of pseudoexfoliation and phacolytic lenses had more complications. PCR was the most common complication.

  15. Sahoo S, Thevi T, Soe HHK
    Malays J Med Sci, 2018 Feb;25(1):96-100.
    PMID: 29599639 MyJurnal DOI: 10.21315/mjms2018.25.1.11
    The purpose of this study was to determine the association of well-being and cognitive impairment with primary open angle glaucoma (POAG) patients attending a tertiary care hospital in Malaysia. Fifty-four individuals were recruited for study as cases were matched with 60 individuals as the control subjects, and data were collected using the WHO well-being index and the validated 6-item cognitive impairment test dementia test. The results showed that there was no significant association between gender, ethnicity, socioeconomic status and POAG. Patients with POAG had significantly lower well-being index scores (mean 67.93) than the control group (mean 81.60) with P-value < 0.001. Similarly, patients with POAG had a significantly higher score of cognitive impairment (CIT test) (mean 6.15) compared to the control group (mean 0.40) with P-value < 0.001. Consequently, POAG is likely to be associated with higher cognitive impairment and lower well-being index.
  16. Thevi T, Abas AL, Stephanie Yen Li C
    BMC Ophthalmol, 2021 Sep 27;21(1):348.
    PMID: 34579663 DOI: 10.1186/s12886-021-02100-4
    BACKGROUND: We conducted the study to compare the psychometric properties of the English version of the Questionnaire and the Bahasa Malaysia (Malay Language) version regarding the vision-related Quality of Life of patients with cataracts.

    METHODS: The Malay version was translated by two independent translators who were well versed in both languages. We carried out a cross-sectional study collecting data between June 2017 and March 2018 in the pre-operative Eye Clinic of Hospital Melaka with 224 respondents (mean age 66.8 years) and another 204 respondents (mean age 64.3 years) participating in the English version and Malay version of the Questionnaire respectively. Methods used to validate the standard questionnaire included the use of construct validity via factor analysis and the deployment of reliability test through assessment of internal consistency via Cronbach's alpha.

    RESULTS: We observed both English and Bahasa Malaysia versions to have high reliability with Cronbach's alpha values of 0.90 and above in factors on difficulty with activities and responses to vision problems. Exploratory factor analysis performed revealed that the three-factor model fits the data well for the English version of the questionnaire - difficulty with activities (23.81 % of variance), responses to vision problem (22.22 % of variance) and general health and vision (14.68 % of variance). The Bahasa Malaysia version of the questionnaire produced three factors with two of the factors resembling the factors from the original version of the questionnaire - difficulty with activities (24.3 % of variance) and responses to vision problem (23.7 % of variance). Item response theory analysis revealed that these factors for both English and Bahasa Malaysia versions comprised of adequately fitted items.

    CONCLUSION: The present study observed that both the English and Bahasa Malaysia versions of the NEI VFQ-25 have comparable construct validity to the original American version. With high validity and reliability, the tool shall be able to provide health care providers the assessment of impact due to cataract and other ophthalmic conditions on the vision-related quality of life of ophthalmic patients.

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