Development of a ciliary muscle driven accommodating intraocular lens
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.) on the outcomes of accommodating intraocular lens (Acc-IOL) implantation. Twenty-four eyes of 24 senile cataract patients who underwent phacoemulsification and Acc-IOL implantation were enrolled.
These postganglionic fibers are part of cranial nerve V (Nasociliary nerve of the trigeminal).Despite the difficulties in measuring accommodation, accommodative IOLs represent the future in the attempt to successfully “cure” presbyopia.The restoration of near vision in older individuals that have entered the presbyopic age is considered one of the major challenges in refractive surgery during the last decade.The zonule fibers relax and the lens becomes more spherical, increasing its power to refract light for near vision.According to Hermann von Helmholtz's theory, the circular ciliary muscle fibers affect zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing.Even though the lenses mentioned offer satisfactory visual results, contemporary ophthalmology has not completely answered the presbyopic dilemma by simulating the accommodative properties of the crystalline lens itself.
Accommodative IOLs were designed to fill this gap and provide satisfactory vision for all distances by restoring some degree of “pseudoaccommodation.” Pseudo accommodative capability can be linked to monofocal IOL’s as well but the results are not satisfactory enough to fully support unaided near vision.
The mean subjective and objective accommodation were 1.54 ± 0.39 D and 1.27 ± 0.41 D, respectively.
The mean postoperative BCDVA and DCNVA (log MAR value) were 0.22 ± 0.11 and 0.24 ± 0.12, respectively.
Eye Measures Vary with Vision Prescription and Age Using eight different high-tech instruments and results of other imaging studies, the researchers made high-resolution measurements of the eye structures in 91 adults, aged 30 to 50 years.
The participants--all free of cataracts or other eye diseases--had vision prescriptions ranging from nearsightedness (myopia) to farsightedness (hyperopia).
There are three principal approaches for the achievement of good near and far vision concomitantly.