Precise Lift Adjustment Knob Equipped with an easy-to-use adjustment knob, the height can be freely customized with a maximum lifting distance of 10cm (4in). It flexibly meets the needs of different patients, ensuring a secure and comfortable fit during examination. Professional Forehead & Chin Support This forehead bracket is specially designed for computer optometry use, providing stable and reliable support for the forehead and chin. It helps users maintain a correct and fixed head position for accurate and consistent optometry results. Stable & Comfortable Design The ergonomic structure provides gentle and firm support, reducing head movement and fatigue during vision testing. It creates a relaxed experience for patients while improving the accuracy of optometry data. Standardized Product Dimensions The front panel measures 200×345mm (8×13.5in), with a lifting height of 100mm (4in). The distance between the chin rest and headrest ranges from 135-235mm (5-9in), suitable for most standard optometry setups. Scope of Application: Widely used in optical shops, optometry centers, eye care centers and other places, automatic refractors, vision training, optical instruments, Manufacturer: RAGOPILEN