A cataract is a vision-hampering disease resulting from the gradual cloudiness and thickening of the natural lens of the eye. A cataract is the leading cause of reversible blindness in the world. Its definitive treatment is lens extraction and placement of an intraocular lens implant. Various methods are utilized to extract the intraocular lens e.g intracapsular extraction, extracapsular extraction, or phacoemulsification, the latter of which is most commonly used.
Placement of multifocal intraocular lenses during cataract surgery allows patients to gain distance and near vision, but careful selection of patients is critical and depends on multiple factors. Not all patients are candidates for multifocal lenses.
Traditional monofocal lenses give patients either good distance or good near vision, but not both. Multifocal lens implants are a manifestation of modern technology to meet the expectations of patients and improve both distance and near vision. They do so by dividing light into different focal points and providing better visual quality. However, careful selection of the patient and type of lens is critical to the success of multifocal lens implants.
Multifocal lenses may use refraction of light, diffraction, or both to help in focusing objects on the retina. Therefore, they are categorized into the following:
They are also known as mono-focal lenses. They are least expensive and provide only fixed vision e.g far, near, or intermediate. The drawback of these intraocular implants is the necessary use of glasses. Patients with astigmatism will have to wear glasses all the time after cataract surgery for the sharpest vision.
Outcomes Of Multifocal Lens Implants
Patient satisfaction depends on identifying vision requirements and expectations, having strong knowledge of IOL designs, potential complications, and their management. Studies show a very high level of satisfaction in general. The trifocal IOLs perform better for patients who desire intermediate vision.
Advanced multifocal lens implants are available now with an expanded depth of focus. The new technologies are being utilized to enhance the vision range with fewer complications.
Complications Of Multifocal Lens Implants
The following are the main factors behind the dissatisfaction of the patient with intraocular lens implants:
Residual refractive error
Posterior capsular opacification
Displacement of the intraocular implant
Inadequate pupil size
Multifocal lenses often allow patients to be glasses free and generally have a very high level of patient satisfaction, but not every patient is a candidate for multifocal lens implants. Their visual needs should be understood completely before surgery.
Your ophthalmologist will conduct an extensive preoperative evaluation to determine the right intraocular lens for you. Talk to them about your options today!