Japanese to English Tech/Engineering Medical: Instruments Ophthalmological Equipment

This term appears in a quality test report of an ophthalmological device in which the device was measured for irradiance levels. It appears on a table alongside terms such as 「XYスポット（ﾄﾉﾒｰﾀ）」, 「Zアライメント」, and 「固視輝点」.

Any help will be much appreciated.