目薬 / めぐすり [megusuri] or 'eye medicine' in Japanese.
Final Fantasy I
Buy: 50 gil
Shop: Pravoka
Drop: Kraken, Ogre Mage
Description: Cures darkness
Final Fantasy II
Buy: 40 gil (sell: 20 gil)
Description: Cures Darkness
Final Fantasy III

Buy: 40 gil (sell: ? gil)
Shop: Ur, Kazus, Canaan, Tozus, Vikings' Cove, Village of the Ancients, Dwarven Hollows, Amur, Duster, Replito, Saronia NW/NE, Doga's Manor, Ancient Ruins, Invincible, Falgabard
Drop/Steal: Hornet, Killer Bee, Larva, Pharaoh, Poison Bat, Revenant, Shadow, Slime
Treasure: Ur, Sealed Cave
Type: Consumable
Effect: Removes Blind
Final Fantasy IV
Use: ?
Buy: 30 gil (Sell: 15 gil)
Final Fantasy V
Use: cures Darkness
Buy: 20 gil (Sell: 10 gil)
Drop: some enemies
Obtain: some chests
Final Fantasy VI
Use: ?
Buy: ? gil (sell: ? gil)
Final Fantasy VII

Use: cures Darkness
Buy: 50 gil (sell: ? gil)
Shop: Costa Del Sol, Kalm, Junon, Shinra Building, Wall Market
Drop: various
Final Fantasy IX

Buy: 50 gil (sell: 25 gil)
Shop: Alexandria (item shop (disc 1+3)), Prima Vista, South Gate (Dali Gate shop, Bohden Arch shop, Summit shop, Vega item shop), Dali (item shop), Lindblum (Alice's shop, Dragon's Gate merchant, Dragoos' shop (disc 3)), Burmecia (Atlas's mogshop), Treno (slum item shop), Cleyra (Star Maiden Nina's shop), Fossil Roo (Mogki's mogshop, Treasure Hunter's shop, Kuppo's mogshop), Conde Petie (Wendy Grocer's shop), Black Mage Village (item shop), Madain Sari (Morrison's shop), Esto Gaza (equipment shop (before Desert Palace)), Hilda Garde 1, Oeilvert (Mimoza's mogshop), Desert Palace (Mojito's mogshop), Mt Gulug (Mogtaka's mogshop), Daguerreo (item shop), Ipsen's Castle (Kumool's mogshop), Bran Bal (Moorock's mogshop)
Drop: (various enemies)
Steal: (various enemies)
Treasure: (various treasures)
Obtain: dig up 19 with Dead Pepper north of Oeilvert next to a small forest
Use: Topaz
Description: Cures Darkness
Final Fantasy X
Buy: ? gil (sell: ? gil)
Obtain: (multiple ways)
Equip effect: x60 for Darktouch, x40 for Darkward, Aeon effect: -
Description: Removes Darkness from one target
Final Fantasy XII
Use:removes Blind from target
Buy: 50 gil (sell: 25 gil)
Other: affected by Nihopalaoa
Final Fantasy XIV

Use: cures Blind
Buy: 1,463 (sell: 88 gil)
Shop: Aylufa, Danyell, Dauid, Hahs Panipahr, Hihiyaja, Papawazu, Sungyve (La Noscea)
Craft: ALC 13 x4 - Lightning Shard, Water Shard, Blindfish, Rock Salt
Type: Remedy, Stack: 99
Description: This alchemically crafted restorative instantly cures blindness.
Final Fantasy Tactics
Use: removes Blind, horizontal range 4 (Chemist ability Item, 80 JP)
Buy: 50 gil (sell: 25 gil)
Shop: (available from the start of the game) everywhere
Description: Medicine that restores sight to those blinded by magick or other causes.
Category: Item