Aspherical lens design using hybrid neural-genetic algorithm of contact lenses

Abstract

The design of complex contact lenses involves numerous uncertain variables. How to help an optical designer to first design the optimal contact lens to reduce discomfort when wearing a pair of glasses is an essential design concern. This study examined the impact of aberrations on contact lenses to optimize a contact lens design for myopic and astigmatic eyes. In general, two aspherical surfaces can be assembled in an optical system to reduce the overall volume size. However, this design reduces the spherical aberration (SA) values at wide contact radii. The proposed optimization algorithm with optical design can be corrected to improve the SA value and, thus, reduce coma aberration (TCO) values and enhance the modulation transfer function (MTF). This means integrating a modified genetic algorithm (GA) with a neural network (NN) to optimize multiple-quality characteristics, namely the SA, TCO, and MTF, of contact lenses. When the proposed optional weight NN-GA is implemented, the weight values of the fitness function can be varied to adjust system performance. The method simplifies the selection of parameters in the optimization of optical systems. Compared with the traditional CODE V built-in optimal scheme, the proposed scheme is more flexible and intuitive to improve SA, TCO, and MTF values by 50.03%, 45.78%, and 24.7%, respectively.

Genetic algorithms for lens design: a review

“…The application of hybrid GAs in lens system design was studied by several authors [10,12,54]. Fang et al proposed a hybrid Taguchi-GA to eliminate chromatic aberrations more effectively than with the conventional DLS method.…”

“…Yen and Jin applied efficiently a GA on aspherical lens design to reduce aberrations in multifocal artificial intraocular lenses (IOL) [10,11]. They inserted a GA by mimicking the variation of thickness and curvature of the human eye into the optical software CODE V to create an IOL design.…”

“…• Systematic method used to optimize an optical design for a LED lens module Chen et al [50] Continued on next page 2014 • GAs used to optimize optical systems Neda HesamMah-moudiNezhad [17] 2015 • Investigation of the influence of aberrations on contact lenses and a hybrid neural-GA was used to optimize the aspherical lens design of myopic and astigmatic eyes Yen and Ye [10] • GA used to design a multifocal IOL design for the human eye Yen and Jin [11] • Hybrid genetic algorithm used to improve field curvature aberration in optical lenses Tsai and Fang [12]…”

“…Its random nature is utilised to improve the search for a global solution [9]. Since 2015, several researchers have applied the hybrid-GA to lens design [10,11,12]. These kinds of GAs can be effectively applied to real-world problems, and contain other techniques within their frameworks.…”

Design of aspheric spectacle lenses using non-dominated sorting genetic algorithm

“…YEN and JIN integrated the GA and commercial optical design software to optimize an artificial intraocular lens to reduce aberrations in the human eye [9]. YEN and YE combined GA with a neural network (NN) to improve the optical performance, which made contact lenses comfortable to wear [10].…”