orthoscope

n.

水检眼镜(19世纪检查眼底的一种仪器，现已废弃)；

orthoscope
orthoscope
From anorthoscope perception to dynamic vision
From anorthoscope perception to dynamic vision
Orthoscope-digital images in dentistry and dermatology
An evaluation of the Keystone Orthoscope astigmatism card
[15 Years experience with D.I. Zimont's orthoscope.]
The Roget Illusion, the anorthoscope and the persistence of vision
[On the ortho-telestereoscope or orthoscope, a new telestereoscope]
[Additional experience with the space synorthoscope. II. Anomalous correspondence and squint angle measurements]