Dietary habits may affect our body by certain mechanisms, visual sense is one of the most vital human senses that needs special attention in our daily habits.

Retinal function directly related to our quality of vision, different drugs can affect our vision in certain ways, however, out unhealthy dietary habits can indirectly affect our quality of life and vision.

Inclusion Criteria:

• healthy subjects with intermittent fasting.
• obese subjects with body mass index more than 30.

Exclusion Criteria:

• patients with any retinal diseases that may ter retinal functional test.
• patients on systemic drugs that may alter retinal function.