- measurement of visual area
- 视阈: visual threshold
- 测量: survey; measure
- 痛阈测量仪: pain threshold surveying i trument; pain threshold surveying instrument; pain threshold surveying instsumen
- 两点阈测量器: tester of two point limen; tester of twopoint limenn
- 视阈: [生理学] visual threshold
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