271 results about "Zone size" patented technology

A method for treating presbyopia by performing ablative photodecomposition of the corneal surface. The offset image of a variable aperture, such as a variable width slit and variable diameter iris diaphragm, is scanned in a preselected pattern to perform ablative sculpting of predetermined portions of a corneal surface. The scanning is performed to ablate an optical zone sized to match the patient pupil with a peripheral transition zone outside the pupil. The shape of the ablated optical zone is different from the shape of the final optical correction on the anterior surface of the cornea. The optical zone corrects for near-vision centrally and far-vision peripherally. A movable image displacement mechanism enables radial displacement and angular rotation of the profiled beam exiting from the variable aperture. The method enables wide area treatment with a laser having a narrower beam than the treatment area, and can be used in the treatment of many conditions in conjunction with presbyopia such as hyperopia, hyperopic astigmatism and irregular refractive aberrations.

The invention discloses an unmanned aerial vehicle pesticide spray path planning system and an unmanned aerial vehicle pesticide spray path planning method. The method comprises the following steps: S1, a control side releases a spray task; S2, the control side defines a task region according to the task; S3, the control side calculates the optimal positions of edge navigation points of a path according to the included angle between the boundary line of the region and the path; S4, the control side adjusts the pesticide solution ratio and wing span width according to the actual line spacing of crops and big data analysis of current crops; S5, the control side calculates out the actual task route based on repeated spray and missing spray weights of crops according to the size of the region and the optimal line spacing; S6, the control side determines the optimal height of the flight route through big data analysis of crops; and S7, the control side performs the spray task according to the planned optimal flight path. The method makes operation uniform, avoids missing spray and repeated spray which may be caused by manual operation, and ensures that spray is performed only once in each region. In agriculture, pesticide use is efficient, and accurate flight route data like flight speed, height and pesticide quantity is obtained based on background big data and analysis of weather.