The value of a zero power intraocular lens.
An intraocular lens with a reversed optic and with haptics angulated forward presses the posterior capsule more posteriorly than other types of lenses. This position is thought to be important even in eyes that do not need intraocular lenses for optical reasons, such as eyes with high axial myopia (because of their increased tendency to postoperative retinal detachment) and eyes with postoperative capsular fibrosis. "Zero lenses" were implanted in seven eyes. The lenses had a convex posterior surface and a concave anterior surface which were parallel. The position of the posterior capsule, measured with ultrasound, was 4.9 mm to 5.8 mm (mean 5.5 mm) behind the anterior corneal surface. In two fellow eyes without a lens (after planned extracapsular cataract extraction), the posterior capsule was 4.1 mm and 4.3 mm behind the anterior corneal surface.
Fechner
P U
PU
Kania
J
J
Kienzle
S
S
D006801:Humans; D007910:Lenses, Intraocular / Q000009:adverse effects; D011183:Postoperative Complications / Q000517:prevention & control; D012029:Refraction, Ocular