Eyes not accommodating
In a simple, 20-minute outpatient surgery, the original lens is replaced by an intraocular lens (IOL) made of plastic, and sight is almost miraculously restored.
However, unlike the natural lens, the IOL cannot be voluntarily brought into focus; while patients can see perfectly in the distance, they must wear glasses to read.
However, the magnitude of movement is relatively small, resulting in accommodation of ) and, possibly, more space in the eye than is actually available.
In effect, the ciliary muscle works properly, but current lens designs do not translate such movement into a sufficient change in optical power.
For example, in theory a 1mm movement along the optical axis of a 19D IOL will produce a change in optical power of Continuous very precise alignment of both lenses relative to the optical axis is necessary to prevent undesired aberrations.
However, in practice, and as measured in actual human eyes, single-optic AIOLs move only – which significantly reduces the accommodation that can be achieved by these lenses to approximately 0.5D.
To be sure of achieving 3D in the eye, the Akko Lens AIOL is designed to provide accommodation of 5–6D, leaving a substantial ‘buffer’ for variations in practice.
If required,accommodation of 8–10D can be obtained without reducing optical quality.
Presbyopia is a condition in which billions of people lose their ability to focus on nearby objects (such as computer screens or newspapers). With cataracts, lens replacement is required to restore sight; with presbyopia, lens replacement is an option rather than a necessity.
In current single-optic AIOLs, these small ciliary movements are converted mechanically by hinges into even smaller lens movements along the optical axis (see Figure 1, left image), producing little change in focal length.
In contrast, the Akko Lens AIOL yields large variations in optical power from tiny movements by using unique cubic opticalelements.
The Akko Lens Accommodating Intraocular Lens The Akko Lens AIOL is based on cubic optical elements that are fitted by spring-like haptics fused at the rim to allow movement.
Optics and Haptics The Akko Lens AIOL has, in its basic configuration, an anterior element with a spherical lens to correct the overall refraction of the eye, and a cubic optical surface for varifocal effect.
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For cataracts, the modern-day monofocal IOL is a simple and safe solution to the catastrophe of blindness; an IOL that accommodates would be a wonderful bonus.