Quality of vision (such as eye health and clear view), which is important for improving a quality of our lives. Nikon Ophthalmology Solutions assists the early diagnosis of eye disease including diabetic retinopathy to lead vision loss and visual field defect.
The core is the ultra-wide field retinal imaging device from the Nikon Group's Optos provides. This device capture the fundus area with approximately 200˚ coverage simultaneously, which contributes to early diagnosis of fundus lesion. Also this provides non-mydriatic diagnosis, so the waiting time of approximately 30 minutes to 1 hour after applying instillation is eliminated. Patients receive various benefits such as allowing them to return to everyday life right after inspection.
Optical system employing an ellipsoidal mirror
The technology of Optos ultra-wide field retinal imaging device is its unique optical system with a concave three-dimensional ellipsoidal mirror is used to scan laser light across the retina. The ellipsoidal mirror reflects the laser light through the pupil to scan the retina. A galvanometer mirror capable of reciprocating oscillation at high speed changes the angle of incidence of the laser beam during irradiation, enabling it to rapidly obtain high-definition images across an ultra-wide field of view.
Using multiple laser lights for scanning
To realize various observations, Optos technology incorporates two kinds of scanning laser (Red 633nm; Green 532nm) that cover different distances. The green laser scans from the sensory retina to the pigment epithelial layers, while the red laser scans from the RPE*1 to the choroid. Also, high-end equipment employs a blue scanning laser for fluorescein vascular inspections*2. In this way, lesion areas can be determined easily.
- *1RPE: Retinal pigment epithelium
- *2Fluorescein vascular inspections: Fluorescein is injected into vessels mainly for examining lesions to the retina and retinal pigment epithelium.