Related Experiment Video
Updated: Jul 17, 2026
10:10
Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
Published on: February 15, 2022
Rapidly progressive idiopathic lenticular astigmatism.
Naing L Tint1, Rakesh Jayaswal, Imran Masood
1Department of Ophthalmology, Division of Ophthalmology and Visual Sciences, Queens Medical Centre, University of Nottingham, Nottingham, United Kingdom.
Journal of Cataract and Refractive Surgery
|February 6, 2007
Summary
This case study reports a rare instance of rapidly progressing lenticular astigmatism in a myopic woman with early cataracts. Cataract surgery successfully corrected the significant astigmatism, restoring clear vision.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Cataract Research
Background:
- A 43-year-old myopic woman presented with early nuclear sclerotic cataract.
- She experienced a rapid increase in astigmatism exceeding 11.0 diopters over six months.
Observation:
- The astigmatism was determined to be of lenticular origin, associated with the developing cataract.
- This rapid progression is unusual in an otherwise healthy eye.
Findings:
- Phacoemulsification with intraocular lens implantation was performed.
- The surgery effectively reduced the astigmatism to a residual 0.75 D.
Implications:
- This case highlights the potential for significant, rapidly progressive lenticular astigmatism in early cataracts.
- It underscores the efficacy of cataract surgery in correcting such refractive errors.
- This is the first reported case of its kind, offering valuable insights for ophthalmologists.
Related Concept Videos
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...
01:28Angle Closure Glaucoma: Treatment
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...
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...
01:16Focusing of Light in the Eye
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
01:22Photoreceptors and Visual Pathways
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, whereas...