Focusing on the characters:
* The Blind Boy
* Timothy's Burden
* A New Teacher
* Learning to See
* Facing the Fear
* The Rescue
* A Bond of Trust
* The Storm Within
Focusing on the setting and events:
* Cast Away
* The Island's Embrace
* The Fury of the Sea
* Under the Sun
* The Unseen Dangers
* Whispers of Hope
* A Different Kind of Darkness
* Finding Light in the Shadows
More evocative titles:
* The Cay's Whisper
* The Silence of the Sea
* The Gift of Sight
* The Broken Promise
* Beyond the Horizon
The best chapter title will depend on the specific content of the chapter you're writing. Consider what's happening in the chapter and choose a title that accurately reflects its key themes and events while also being intriguing and evocative.