Description

The 27D Microphtalmic Intraocular Lens (IOL) is a specialized one-piece lens designed for patients with microphthalmia. Crafted from polymethyl methacrylate (PMMA), both the optic and haptic components ensure durability and biocompatibility.

Optic Design

• Biconvex Structure: The lens features a biconvex optic with a diameter of 5.0 mm and an overall length of 12.0 mm.
• Monofocal Spheric Lens: It is monofocal, refractive, and spheric with a spherical aberration of +0.2μ.
• UV Protection: Provides UV-light protection without additional blue light control.

Haptic Design

• Angulation: The haptic design includes a 6-degree angulation, aiding in stable positioning within the eye.

Optical Properties

• Refractive Index: 1.49
• A Constant: 118.7 (Optical SRK T)
• ACD Constant: 5.37
• Dioptric Power: Extends up to +75.0D, catering to extreme hyperopia cases.

Surgical Considerations

• Incision Size: Requires a 5.2 mm incision size.
• Not Preloaded: Suitable for bimanual phacoemulsification.
• Intended Use: Designed for aphakia or cataract surgery in microphthalmic eyes.

Clinical Performance

• Visual Acuity: Offers satisfactory distance and near visual acuity with minimal change in keratometric astigmatism post-implantation.
• Posterior Capsular Opacification: Exhibits a higher rate compared to some other IOLs.
• Halo Effect: Patients may notice significant haloes around light sources.

Research Insights

Studies have noted alterations in corneal incision architecture in specimens implanted with the 27D IOL compared to lower power IOLs. While automated and preloaded delivery systems are not applicable to this IOL, they have shown improved outcomes in corneal incision architecture in other comparative studies.