Stretching 30 kilometres from Kirribilli to Bondi Beach, the approximate five-hour trek aims to raise $2.8 million for The Fred Hollows Foundation.

A member of four-person team Pearl Button, Ms Mitchell has raised $2500 and said she hopes for extra community support for a cause she passionately supports.

“The reason I support Fred Hollows is because I am a designer and my eyes are incredibly important to me,” she said.

“I can’t imagine what it would be like to live in a developing country and not be able to afford surgery that will restore your sight.”

Completing the five-hour trek with her cousin and Pearl Button teammates, Ms Mitchell said it is an enjoyable day for a good cause.

“It is slightly self-indulgent to be having fun while you are raising money for a serious charity, but I guess it gets people excited by it.”

Since Coastrek began in 2010 nearly 19,000 trekkers have raised more than $14 million for The Fred Hollows Foundation.

The funds have restored sight for hundreds of thousands of people and helped prevent avoidable blindness by training local eye doctors and health workers to provide eye health awareness, screening and treatment.

This year’s fundraising goal of $2.8 million could give the gift of sight to up to 112,000 people.

Wild Women on Top Coastrek founder Di Westaway said Sydney Coastrek was a way for women to come together for their own health and wellbeing, while also changing the lives of others.

“Coastrek helps women feel awesome about themselves and about helping others,” she said.

“It supports them in regaining their confidence, often after health or personal challenges, and helps them to be active and healthy.

“Coastrek has an even greater impact on the millions of women and girls who make up two-thirds of the world’s blind.”

To donate to Dinah Mitchell, click here.