Simulation of an improved galilean telescope optical system for correction of moderate and high hyperopia

Moderate and high hyperopia is a common clinical refractive error that severely affects distant and near visual functions. Traditional correction relies on high-power positive spherical lenses, which are prone to problems such as thick lens thickness, heavy weight, poor wearing comfort, and limited visual correction effect, resulting in low wearing compliance and reduced life quality of patients. Existing telescopic correction devices have the defects of large volume and narrow imaging field of view, which cannot meet the needs of daily clinical correction. This study aims to construct an improved optical correction system based on the Galilean telescope principle, and explore a low-burden, high-efficiency novel correction scheme for moderate and high hyperopia.

Based on the afocal imaging theory of Galilean telescopes, a novel diopter-splitting optical structure was constructed with a zero-diopter air lens as the core component. The total diopter of hyperopic refractive error was decomposed and redistributed optically. A low-power positive lens was adopted to undertake the major correction of hyperopia, while the residual refractive diopter was matched with a negative eyepiece corresponding to the hyperopic degree. Combined with a positive spherical objective lens, the optical interval between lens groups was precisely optimized to form a compact Galilean telescopic correction system with the magnification limited within 2.0 × . Optical simulation was conducted to explore the quantitative relationships among optical magnification, system structural size, imaging distortion and field of view, so as to determine the optimal wearable structural parameters for clinical application.

The proposed novel optical system can effectively correct moderate and high hyperopia merely by using low-power positive lenses, which completely eliminates the clinical drawbacks of traditional high-power lenses such as excessive thickness and heavy weight. When the magnification is controlled within the range of 1.2 × -1.5 ×, the system features an ultra-compact structure, excellent wearability, wide imaging field of view and negligible optical distortion. Excessively high magnification (over 2.0 ×) will greatly narrow the peripheral visual field, reduce the effective imaging area, and significantly weaken the practical wearable value of the device. Reasonable low magnification can effectively magnify retinal images, relieve blurred vision caused by refractive defocus, and alleviate long-term visual fatigue in hyperopic patients.

The improved Galilean telescopic correction system realizes innovative diopter-splitting correction for moderate and high hyperopia, breaking the limitations of traditional hyperopia correction lenses and conventional telescopic optical devices. The optimized low-magnification optical structure has the advantages of compact volume, wide field of view, low distortion and good wearing adaptability. It can effectively improve visual acuity and daily visual quality of patients with moderate and high hyperopia, and greatly enhance life satisfaction. This system has broad application prospects in clinical optometric correction and low-vision rehabilitation.