Aphakia: Causes, Optical Consequences, and Correction Options

Aphakia is the absence of the crystalline lens, most commonly after cataract surgery without intraocular lens (IOL) implantation, or due to trauma/dislocation.

Optical Effect

Loss of the lens (~+18 to +20 D power) causes high hyperopia (farsightedness). The eye cannot focus near or intermediate objects without correction.

Correction Options

• Spectacles: High-plus lenses (+10 to +14 D). Thick, heavy, cause magnification (~25%), peripheral distortion, restricted field of view.
• Contact Lenses: Rigid gas permeable or soft; better optics, less magnification, wider field. Require handling dexterity.
• Intraocular Lens (IOL) Implantation: Standard of care in modern cataract surgery. Restores near-physiological optics. Can be primary (during cataract surgery) or secondary (sutured/scleral-fixated if capsular support absent).

IOLs are made of acrylic, silicone, or hydrophobic materials, folded for insertion through a small corneal incision. They provide permanent, maintenance-free correction.