The design of Dream David IV-DF is based on the application data feedback of large sample sizes in the OPCS order system, combined with the characteristics of the eye structure of the Chinese, and adopts the corneal morphology based on the four-zone multi-arc design with tears balance. Aspherical design with consistent characteristics, each parameter can be customized according to the difference in the wearer's cornea.

The design of Dream David IV-AP is based on the application data feedback of large sample sizes in the OPCS order system, combined with the characteristics of the eye structure of the Chinese, and adopts corneal morphology based on the four-zone multi-arc design with tears balance. Aspherical design with consistent characteristics, each parameter can be customized according to the difference in the wearer's cornea.

The material is made of BOSTON XO material. The physical characteristics such as oxygen permeability, refractive index, hardness, and physiological compatibility of the material are fully in line with relevant national and industry regulations.

The Dream David IV-AP type integrates a number of production technologies such as "arc integrated edge processing" and "lens surface treatment" during the lens production process. The fitting adopts standard film trial-on method and integrates ring curved surfaces, small diameters, etc. Special lens design technology.