The Deep Blue Sunglasses (410079) can be made by the NPC Cool Mechanic.
You can find her at (m_crafting 56, 39).

Item

Deep Blue Sunglasses (410079) Sunglasses specially coated in dark blue. Excellent for UV protection. ─────────── Decreases Variable Casting Time by 10%. ─────────── Type: Armor Position: Head Mid Armor Level: 1 Weight: 10

Deep Blue Sunglasses [1] (410080) Sunglasses specially coated in dark blue. Excellent for UV protection. ─────────── Decreases Variable Casting Time by 5%. ─────────── Additional abilities can be activated by using the Lens Craft Stone. Lens Craft Stone can be obtained from <NAVI>[Muszaszir]<INFO>gem_market,168,207,0,100,0,0</INFO></NAVI>, by using Nyanvine Fruit or Zeny. ─────────── This item can't receive additional enchantment from Piercing Brosnan. ─────────── Type: Armor Position: Head Mid Armor Level: 1 Weight: 10

Deep Blue Sunglasses (410079) can be slotted with Soul Plunger (25041) to get Deep Blue Sunglasses [1] (410080) .

Deep Deep Blue Sunglasses [1] (410080) can be enchanted with Lens Craft Stone (100823) . You can buy this Stone at Muzaszir.
Two options will be given randomly as following table:

If you get unwanted options: You can re-enchant it as much as you want as long as you have enough zeny or Nyangvine Fruit to buy Lens Craft Stone (100823) .