Some GP Keratoconus lenses have abberration control incorporated into their design. Is this necessary and what advantages does this have over lenses that do not have abberation control?
The most common type of lens aberration is spherical aberration and it is caused by two lens surfaces not being parallel; the front surface of the lens being significantly flatter than the back surface. This causes light passing through different points on the lens to have different focal points onto the retina (back of the eye) and produces a ‘ghost’ image around the original image like a tv set that is not tuned properly. By subtly changing the curves on the surface of the lens a significant amount of the spherical aberration can be eliminated. The amount of spherical aberration produced is proportional to the lens power, so as keratoconus gets worse, the lens power also needs to increase and so does the spherical aberration. Keratoconus patients commonly require very high powers on their lenses to see well and therefore obtain significant benefit from having aberration control incorporated into their lenses. Rose K2 is an example of a lens which has aberration control. In a study in
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