1. Having sharp clear vision 
2. Mentally acute or penetratingly discerning
   "chaos could be prevented only by clear-sighted leadership"
   - clear-eyed, perspicacious

See also: discerning, sighted

• T cell
• T hinge
• T lymphocyte
• T'ien-ching
• T-bar
• T-bar lift
• T-bill
• T-bone
• T-bone steak
• T-junction
• T-man
• T-network
• t-scope
• T-shaped
• T-shirt
• T-square
• T. E. Lawrence
• T. H. White
• T. S. Eliot
• ta
• Ta'ziyeh
• ta-ra
• ta-ta
• Taal
• tab