Related Experiment Video
Updated: Jul 19, 2026

04:59
Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries
Published on: July 7, 2023
Probable edge defect in Acrysof single-piece intraocular lens
1Cornea and Anterior Segment Consultant, The Eye Super Specialties, Mumbai, India. eyetess@vsnl.net
Indian Journal of Ophthalmology
|November 9, 2006
Summary
A rare edge defect in a single-piece hydrophobic acrylic intraocular lens (IOL) caused glare due to posterior capsular folds. Pre-operative microscopic inspection of IOLs is crucial to prevent such visual disturbances.
Area of Science:
- Ophthalmology
- Materials Science
Background:
- Single-piece hydrophobic acrylic intraocular lenses (IOLs) are commonly used in cataract surgery.
- Routine phacoemulsification procedures involve implanting these IOLs after removing the natural lens.
Observation:
- An intraoperative observation of an edge defect (a chip) on a single-piece hydrophobic acrylic IOL during phacoemulsification.
- The defect was successfully managed with McPherson's forceps during the surgery.
Findings:
- Postoperatively, the patient experienced significant glare attributed to posterior capsular folds originating from the IOL defect site.
- The patient declined Nd:Yag laser capsulotomy for symptom relief.
Implications:
- Highlights the critical need for meticulous pre-operative inspection of all foldable intraocular lenses under magnification.
- Emphasizes the potential for subtle IOL defects to cause long-term visual complications, such as glare and astigmatism.
- Underscores the importance of quality control in intraocular lens manufacturing and handling to ensure patient visual outcomes.
Related Concept Videos
Glaucoma: 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...
Angle 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...
Imperfections in Crystal Structure: Point, Line and Plane Defects
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Focusing 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...
Imperfections in Crystal Structure: Stoichiometric Point Defects
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

