Mean length of preclinical detectable phase of glaucoma is over 10 years

Mean length of preclinical detectable phase of glaucoma >10 years

The mean length of the preclinical detectable phase (PCDP) of open-angle glaucoma is estimated to be over 10 years, according to a study published online Nov. 23 in JAMA Ophthalmology.

Johan Aspberg, M.D., from Lund University in Malmö, Sweden, and colleagues estimated the mean PCDP for open-angle glaucoma in a large population-based screening, including 32,918 participants aged 57 to 77 years.

The prevalence of newly detected cases at the screening, incidence of new cases after the screening, and expected clinical incidence (number of new cases expected to be detected without screening) were assessed. The cohort included 2,029 patients.

The length of mean PCDP was calculated by two methods: dividing the prevalence of screen-detected glaucoma by clinical incidence, assuming 100 percent for screening, and using a Markov chain Monte Carlo (MCMC) that derived the length of mean PCDP and sensitivity of screening simultaneously.

The researchers found that the mean age at screening was 67.4 years for the 1,420 screened patients. The mean length of the PCDP was 10.7 years for the whole study population by the prevalence/incidence method, and 10.1 years by the MCMC method.

"We have not tried to analyze whether screening is cost-effective, but our results suggest that for , if repeated, could be done with relatively long intervals, e.g., five years," the authors write.

Several authors disclosed financial ties to the pharmaceutical and medical technology industries.

More information: Johan Aspberg et al, Estimating the Length of the Preclinical Detectable Phase for Open-Angle Glaucoma, JAMA Ophthalmology (2022). DOI: 10.1001/jamaophthalmol.2022.5056

Alfred Sommer, Screening for Primary Open-Angle Glaucoma, JAMA Ophthalmology (2022). DOI: 10.1001/jamaophthalmol.2022.5058

Journal information: JAMA Ophthalmology

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Citation: Mean length of preclinical detectable phase of glaucoma is over 10 years (2022, November 29) retrieved 1 February 2023 from https://medicalxpress.com/news/2022-11-length-preclinical-phase-glaucoma-years.html
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