Abstract:

According to the World Health Organization, cataracts are the leading cause of blindness in the world. It is a polyetiological disease of the eye, the main feature of which is the sclerosis of the main substance of the lens or its capsule. Today, the only way to combat it is to remove the contents of the lens and then replace it with an intraocular lens (IOL). The change in the position of the implanted IOL occurs in 0.2-2.8%. Dislocation is associated with many factors, one of which is the imperfection of the haptic elements and the violation of the contact of the haptic with the lens capsule due to the mismatch between the size of the IOL and the capsule. For reliable fixation of the IOL in the eye, suture fixation of the lens is recommended. The purpose of the work is to model the effect of the lens capsule and the forces of the ligaments on the haptic lens and to develop an IOL that would be securely fixed in the lens capsule. To create a 3D model of the IOL and simulate the effect of the lens capsule and the forces of the ligaments bonds on it, Solidworks software environment with a Simulation library and a specially designed installation, patent UA 141280 U were used. For modeling were used intraocular lenses parameters that creates serially. Based on the simulation, it was found that monolithic IOLs made of polymethyl methacrylate and acrylic, when a force of 0.6 H is applied, have insufficient strength and elasticity of the haptic elements, which leads to the dislocation of the IOLs in the postoperative period. During the simulation of seamless implantation, the broken of the haptic was fixed at the point of contact of the haptic - the lens, and at the suture fixation- at the point of contact of the haptic “special elements” with filament. The use of volume replacement lenses without fixation in case of mismatch between the implant and ciliary sulcus diameters may be accompanied by decentration. A high-quality IOL should ensure full tension of the lens capsule with a relatively small mass and be fixed to prevent displacement. Therefore, the proposed volume-replaceable IOL of its own design, which provides close contact with the lens capsule, evenly distributing the load on the zonula ciliaris, reduces the risk of rarefaction of the vitreous body and retinal detachment, has elements for suture fixation.

Keywords: IOL, haptic, lens, lens capsule bag, cataract, SolidWorks