OPHTHALMOMETER HAVING CHART CHANGE DEVICE

摘要

PURPOSE: An ophthalmometer having a chart change device is provided to minimize the motion of eyes and a measurement error for a refractive index by using the chart change device having charts for providing various images. CONSTITUTION: An ophthalmometer having a chart change device includes a lamp(22), a chart support unit(60), and a driving unit(66). The lamp(22) is used for radiating the visible ray. The chart support unit(60) is installed at a front side of the lamp(22). Two or more charts are installed in the chart support unit(60). The driving unit(66) shifts the chart support unit in order to form an image on the chart by locating the chart of the chart support unit on a traveling path of the visible ray radiated from the lamp(22). Three charts having different images are installed in a period of 120 degrees at the chart support. Three opening portions are opposite to the three charts in order to output the images.