Tekia accommodating intraocular lens Freewebchatnude
Lenses implanted in the posterior chamber are described in U. However, the ciliary muscles do not exert any force during contraction because the zonules, being flexible filaments, exert only tension, not compression on the capsule.
The natural elasticity of the lens causes the capsule to become more spherical upon contraction of the ciliary muscle.
However, the envelope and the optical section are not unitarily constructed.
The non-unitary construction of the optical section and the envelope that are responsive to ciliary muscle contraction and retraction, results in increased wear and tear of the lens.
In preferred embodiments, the individual anterior and posterior sections may be joined by a continuous section presenting an annular orifice therein.
The positioning element further comprises at least one and preferably a plurality of haptic arms extending between an optic and the circumferentially spaced apart segments.
When the intraocular lens is located in this natural location, substantially normal vision may be restored to the patient and the problems of forward displacement of vitreous humor and retina detachment encountered in anterior chamber intraocular lenses are less likely to occur. 3,718,870, 3,866,249, 3,913,148, 3,925,825, 4,014,552, 4,053,953, and 4,285,072. Lenses capable of focusing offered the wearer the closest possible substitute to the natural crystalline lens. The '691 lens is deficient because it requires the ciliary muscle to exert force through the zonules on the capsule in order to compress the haptics inward and drive the optic forward for near vision.The cataracts may be in both eyes and, being a progressive condition, may cause fading vision and eventual blindness.Cataracts were once surgically removed along with the anterior wall of the capsule of the eye.The optic positioning element comprises an anterior section configured for yieldable engagement with the anterior capsule wall, a posterior section configured for yieldable engagement with the posterior capsule wall, a bight, in cross section, joining said anterior and posterior sections, and a haptic arm extending between said optic and said optic positioning element.Another preferred embodiment of the lens of the invention may further comprise a posterior optic also presenting opposed anterior and posterior surfaces coupled to the optic positioning element.
The lens should comprise a structure which inhibits the growth of fibrotic tissue and avoids damage to the ciliary body and other eye components.