Biomedical subjects

D H Sim

Publications and source records attributed to D H Sim.

4 recordsLinked to original sources

PubMed1999

Glaucoma update--what physicians and the public need to know.

With the aging population in Singapore, glaucoma will be more prevalent. The majority of glaucomas are silent and typically present late with advanced damage. A large proportion of glaucomas remain undetected. Screening for glaucoma is the only way to detect glaucoma early and high-risk groups should be screened. Early detection is important in preventing blindness as treatment is more difficult and less effective in the advanced stages of glaucoma. Greater awareness amongst physicians and the public is vital in the prevention of glaucoma blindness.

Aged↗

PubMed1999

Screening for glaucoma in the Chinese elderly population in Singapore.

AIM: To determine the performance of different tests in screening for glaucoma. METHOD: The results from a glaucoma prevalence study of 479 Chinese elderly Singaporeans were analysed. Glaucoma screening tests evaluated in this study included Goldmann applanation tonometry (GAT), non-contact tonometry (NCT), optic disc assessment, screening Humphrey visual field and gonioscopy. The sensitivity, specificity and positive predictive values of the various screening tests in detecting glaucoma were calculated. RESULTS: The sensitivity of GAT and NCT at a specificity of at least 90% was 26% and 30% respectively with a low positive predictive value (PPV) of 0.13. Optic disc assessment with a vertical cup-disc ratio cut-off of more than 0.7 had a sensitivity of 100% and a specificity of 94% and a PPV of 0.46. The sensitivity of visual fields was 100% with a specificity of 76% and a PPV of 0.17. Gonioscopy had a sensitivity of 100% and specificity of 93% and a PPV of 0.14 in detecting primary angle closure glaucoma. CONCLUSION: Optic nerve assessment performed better than other glaucoma screening tests. There are, however, many other considerations that need to be taken into account in determining the ideal test for population screening.

Aged↗

PubMed1998

Glaucoma pattern amongst the elderly Chinese in Singapore.

Glaucoma is a major blinding condition and is more prevalent amongst the elderly. A population study of 479 elderly Chinese aged 60 years and older, and residing in Singapore was carried out to determine the prevalence of glaucoma. The overall glaucoma prevalence was 4.8% with normal tension glaucoma (61%) and primary angle closure glaucoma (26%) being the most prevalent forms of glaucoma. All cases were silent in presentation with 97% of cases previously undiagnosed. With the greying population in Singapore, the issue of screening the elderly for glaucoma should be considered.

Aged↗

PubMed1997

Iris varix.

Varix of the iris as a solitary primary lesion is rare. We report a 31-year-old Indian man with an iris varix who developed recurrent haemorrhages into the anterior chamber which led to secondary glaucoma. An iridectomy was performed and the diagnosis was confirmed histologically. There has been no recurrence of the lesion 3 years after surgery.

Adult↗