Eyes not accommodating
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.
In addition, the Akko Lens AIOL can correct spherical aberrations, astigmatisms, comas and higher order aberrations, for example those caused by the cornea.
Uniquely, the Akko Lens AIOL can correct ‘variable aberrations’ of the eye – i.e.
A truly accommodating IOL would improve treatment for cataracts and offer the possibility of restoring focal accommodation to presbyopes.
Once an AIOL has been proved to work in cataract patients, the potential for treating presbyopes will represent a potentially vast unexploited opportunity in the healthcare market.
The Design of Accommodating Intraocular Lenses The pseudophakic eye (an eye with an IOL implant) can achieve limited accommodation by shifting a single lens along the optical axis.
Most current AIOL designs are based on this type of shift, which alters the overall refractive power of the eye to produce a variable focal plane.
Every year over 10 million people have surgery to replace their lenses as a result of cataracts, and the number of cases is increasing by approximately 15% each year, in step with ageing populations.
In practice on the optical bench, undesired aberrations were virtually absent over the complete range of accommodation (see Figure 5).
As discussed above, in order to read clearly approximately 3D of accommodation is required.
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.
For presbyopes, however, there is absolutely no point in removing a healthy but inadequate natural lens by clear lens extraction if it cannot be replaced by a far superior IOL that accommodates.