Related Experiment Video
Updated: Mar 27, 2026
07:11
Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
Published on: May 25, 2020
6.9K
Comparison between visual field defect in pigmentary glaucoma and primary open-angle glaucoma.
Naveed Nilforushan1, Maryam Yadgari2, Anisalsadat Jazayeri1
1Eye Research Center, Rassoul Akram Hospital, Iran University of Medical Sciences, Nyayesh St, Satarkhan Ave, Tehran, Iran.
International Ophthalmology
|January 14, 2016
Summary
Primary open-angle glaucoma (POAG) shows more temporal visual field defects than pigmentary glaucoma (PG). This suggests the temporal area is more vulnerable in POAG patients compared to PG patients.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Visual Field Analysis
Background:
- Glaucoma encompasses various optic neuropathies, with primary open-angle glaucoma (POAG) and pigmentary glaucoma (PG) being common types.
- Understanding differences in visual field defect patterns is crucial for diagnosis and management.
Purpose of the Study:
- To compare the visual field defect patterns between patients with primary open-angle glaucoma and pigmentary glaucoma.
- To identify specific locations and sectors of the visual field that are differentially affected in POAG versus PG.
Main Methods:
- Retrospective comparative study analyzing Humphrey visual field (24-2 test) data from mild to moderate stage POAG and PG patients.
- Statistical comparison of 52 point locations and six predetermined sectors using SPSS software, employing Student t-tests and Chi-square tests.
Main Results:
- Patients with POAG exhibited significantly more visual field deviations in specific temporal points (1, 3, 4, 32) compared to PG patients.
- These temporal deviations were observed in both total deviation and pattern deviation plots, indicating localized damage.
Conclusions:
- The temporal region of the visual field appears to be more susceptible to damage in primary open-angle glaucoma than in pigmentary glaucoma.
- These findings highlight distinct patterns of visual field loss that may aid in differentiating between POAG and PG.
More Related Videos
Related Concept Videos
01:25Glaucoma: Overview
1.6K
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
1.6K
01:22Photoreceptors and Visual Pathways
11.0K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
11.0K
01:27Open Angle Glaucoma: Treatment
1.1K
In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Drugs such as carbonic anhydrase inhibitors, α2- and...
1.1K
01:28Angle Closure Glaucoma: Treatment
1.6K
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...
1.6K