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Related Concept Videos

Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

463
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
463
Adjusting a Traverse01:12

Adjusting a Traverse

53
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
53
Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

74
Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
74

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Related Experiment Video

Updated: Jun 18, 2025

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
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Published on: September 27, 2024

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The Beijing angle closure progression study: design and methodology.

Zhi-Qiao Liang1,2, Kang-Yi Yang1,2, Kun Lv1,2

  • 1Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Department of Ophthalmology, Peking University People's Hospital, Eye Diseases and Optometry Institute, Beijing, China.

Frontiers in Medicine
|August 1, 2024
PubMed
Summary

The Beijing Angle Closure Progression Study (BAPS) tracks primary angle-closure suspect (PACS) progression to primary angle-closure (PAC) or glaucoma (PACG) over 5 years in China. It aims to identify risk factors for this vision-threatening condition.

Keywords:
incidenceprimary angle-closureprimary angle-closure glaucomaprimary angle-closure suspectprogression of angle closurerisk factors

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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Public Health

Background:

  • Primary angle-closure glaucoma (PACG) is a leading cause of irreversible blindness globally.
  • Early detection and intervention for primary angle-closure suspect (PACS) are crucial to prevent progression to PACG.
  • Limited data exists on the incidence and risk factors of PACS progression in Asian populations.

Purpose of the Study:

  • To determine the 5-year incidence of PACS progressing to primary angle-closure (PAC) or primary angle-closure glaucoma (PACG).
  • To identify potential risk factors associated with the progression of PACS.
  • To aid in redefining high-risk individuals with PACS for targeted management.

Main Methods:

  • A prospective, multicenter, noninterventional trial involving 825 urban Chinese adults with PACS.
  • Standardized baseline examinations including visual acuity, intraocular pressure (IOP), optic disc evaluation, visual field testing, OCT, and ultrasound biomicroscopy.
  • Annual follow-up visits for 5 years, with emergency room visits for acute angle-closure episodes.

Main Results:

  • Data collection is ongoing; 5-year incidence and risk factor analysis are pending.
  • The study is designed to provide robust epidemiological data on PACS progression.
  • Baseline characteristics and risk factor associations will be analyzed upon study completion.

Conclusions:

  • The Beijing Angle Closure Progression Study (BAPS) will provide critical insights into the natural history of PACS in a large Chinese cohort.
  • Findings are expected to inform clinical guidelines and improve the management of angle-closure disease.
  • The study aims to enhance the identification and treatment of individuals at high risk for vision loss from PACG.