Vision of the Future

Vision of the Future is a quest

Detailed walkthrough
Overseer Barstow next complains that the Hippocratic Oath is backwards and that doctors should focus on the greater good of the Vault, rather than patients' welfare. She requests you to build a phoropter prototype, which must be powered and programmed as per the previous objects.

The three parameters involved are Subliminal Messaging, Vault Monitoring, and Improved Eye Care. Most companions will hate the negative parameters and like the positive one.

There are a few possible outcomes for this quest: After completing the quest, the phoropter can be mass produced. It's located on the Vault tab under Resources, while on workshop mode. The stats of the device depend on the experiment option that was chosen.
 * Choosing all three positive parameter will result in the unnamed dweller to express satisfaction and stay in the vault regardless, But overseer Barstow in the other hand will feel disappointed.
 * Choosing only one negative parameter will result in the unnamed dweller question the experiment and attempt to leave, a speech check can be used convince them to stay.
 * Choosing two or more negative parameter for the three projects, the unnamed dweller will get angry and leave the vault.
 * Selecting the subliminal messaging experiment option makes the device provide 15 points of happiness for 6 units of power, at the risk of killing random non-essential settler (2% chance per day).
 * The Vault monitoring option provides 5 points of happiness for 3 units of power, and can also kill settler (1% chance per day).
 * The improved eye care option provides 10 points of happiness for 3 units of power, without any risk of death.