colored ophthalmic glasses
有色眼镜

• switch(ing)-over
• switching time
• switch value
• swiveling
• swivel slide
• swivel table
• sylvaine
• sylvatron
• symbol
• symbolic code
• symbolism
• symcenter
• symmetric(al)
• symmetrical
• symmetrical all-dielectric interference filter
• symmetrical astigmatism
• symmetrical camera lens
• symmetrical combination of films
• symmetrical confocal geometry
• symmetrical coordinate
• symmetrical copying objective
• symmetrical doublet lens
• symmetrical effect
• symmetrical eyepiece
• symmetrical lens