Related Experiment Video
Updated: May 26, 2026
09:53
Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
Published on: July 5, 2021
Visual function alterations in orbital tumors and factors predicting visual outcome after surgery
D Singh1, N Pushker, M S Bajaj
1Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India.
Eye (London, England)
|December 14, 2011
Summary
Orbital tumors negatively impact vision, affecting visual acuity, color vision, and visual evoked response. Surgery improves these visual functions, with outcomes depending on initial presentation and tumor characteristics.
Area of Science:
- Ophthalmology
- Neurology
- Oncology
Background:
- Orbital tumors can compromise visual function through various mechanisms.
- Understanding the impact of these tumors on vision is crucial for patient management.
Purpose of the Study:
- To investigate the effects of orbital tumors on visual functions.
- To identify predictors of visual outcomes following surgical intervention.
Main Methods:
- A prospective study evaluated visual parameters before and after surgery in patients with orbital tumors.
- Parameters included visual acuity, refractive error, keratometry, color vision, Goldmann visual field (GVF), and visual evoked response (VER).
Main Results:
- Orbital tumors led to decreased visual acuity, increased hyperopia, and higher astigmatism.
- Fundus changes like disc edema and choroidal folds were observed, with disc edema resolving post-surgery.
- Significant improvements in visual acuity, VER latency/amplitude, and GVF abnormalities were noted after surgery.
Conclusions:
- Orbital tumors adversely affect visual functions, including visual acuity and VER.
- Presenting visual acuity is influenced by disc changes and VER latency.
- Postoperative visual acuity is predicted by presentation acuity, proptosis, hyperopia, and VER abnormalities.
Related Concept Videos
01:27Open Angle Glaucoma: Treatment
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...
01:25Glaucoma: Overview
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...