Development of a ciliary muscle driven accommodating intraocular lens
This release of tension of the zonular fibers causes the lens to become more spherical, adapting to short range focus.Conversely, relaxation of the ciliary muscle causes the zonular fibers to become taut, flattening the lens, increasing the focal distance, increasing long range focus. Contraction and relaxation of the longitudinal fibers, which insert into the trabecular meshwork in the anterior chamber of the eye, cause an increase and decrease in the meshwork pore size, respectively, facilitating and impeding aqueous humour flow into the canal of Schlemm.
The persistence of the function of the ciliary body during presbyopia is expected, because each effort to focus on an object made by the presbyopic patient, even wearing reading glasses for near vision, will cause convergence and pupillary contraction, so it will activate the ciliary body.Due to the advances in cataract surgery with the introduction of the femtosecond laser and the micro-incision surgery (MICS), a large number of Intraocular Lenses have been introduced to restore the patient's vision.Until relatively recently, among the corneal surgical alternatives that a patient had to improve his near vision, there were the techniques of monovision Near Vision Conductive Keratoplasty (Near-Vision CK) (Refractec, Irvine, CA), Cataract surgery allows the implantation of diverse types of Intraocular Lenses to correct presbyopia, like multifocal intraocular lenses (refractive, diffractive and hybrid), which provide simultaneous images to the visual system.Although Helmholtz's theory has been widely accepted since 1855, its mechanism still remains controversial. Open-angle glaucoma (OAG) and closed-angle glaucoma (CAG) may be treated by muscarinic receptor agonists (e.g., pilocarpine), which cause rapid miosis and contraction of the ciliary muscles, opening the trabecular meshwork, facilitating drainage of the aqueous humour into the canal of Schlemm and ultimately decreasing intraocular pressure.Alternative theories of accommodation have been proposed by others, including L. The term cilia originated a few years later in 1705–1715, and is the Neo-Latin plural of cilium meaning eyelash.