What Is a Contact Lens Behind the Eye
A contact lens worn behind the eye refers to an intraocular lens or implantable contact lens placed inside the eye, typically during refractive surgery. Unlike surface contacts, these lenses sit behind the iris and in front of the natural lens, correcting myopia, hyperopia, or astigmatism. The global intraocular lens market was valued at approximately 4.6 billion USD in 2023 and is projected to grow at a compound annual growth rate of around 5.5 percent through the next decade, according to market research firms Forbes.
The most common implantable lens procedures include phakic intraocular lens implantation and refractive lens exchange. In phakic IOL procedures, the natural lens remains intact, and the implantable lens is positioned either in front of or behind the iris. Surgeons use precise biometry and corneal topography to select lens power, with outcomes showing a high rate of visual acuity improvement. Regulatory bodies such as the U.S. Food and Drug Administration evaluate these devices for safety and efficacy before approval.
Leading Companies and Regulatory Approvals
Major manufacturers of implantable contact lenses include Alcon, Johnson & Johnson Vision, Bausch + Lomb, and Zeiss. Alcon offers the PanOptix and Vivity intraocular lenses for cataract and refractive applications, while Johnson & Johnson Vision markets the Tecnis family of lenses. Zeiss produces the AT LISA tri and AT LISA toric lenses, which are used in refractive lens exchange procedures worldwide. These companies invest heavily in clinical trials and regulatory submissions to maintain market positions.
The U.S. Food and Drug Administration has cleared several implantable lenses for specific indications, including the Implantable Contact Lens for myopia correction. The approval process requires data on safety, biocompatibility, and long-term outcomes. In Europe, the Conformité Européenne marking and Notified Body certification allow market access, with ongoing post-market surveillance. Companies must report adverse events and update labeling based on new clinical evidence.
Safety, Risks, and Patient Outcomes
Implantable contact lens surgery carries risks such as endothelial cell loss, cataract formation, increased intraocular pressure, and infection. Studies published in peer-reviewed ophthalmology journals report endothelial cell density loss of approximately 5 to 10 percent over five years following implantation. Surgeons monitor patients through regular slit-lamp exams and endothelial microscopy to detect early signs of complications.
Patient satisfaction rates for implantable contact lenses are generally high, with many achieving 20/20 or better uncorrected visual acuity. A 2023 survey of refractive surgery patients showed that over 90 percent reported improved quality of life and reduced dependence on glasses or surface contact lenses. The American Academy of Ophthalmology provides guidelines on patient selection, emphasizing factors such as anterior chamber depth, endothelial cell count, and pupil size to minimize risk.