At a Glance: Seeing depends on the eyes and brain working together. Clear letters on an eye chart are only part of the picture. Persistent blur, double vision or discomfort with close work deserves an eye examination.
Published: 19 November 2020. Last Updated: 24 September 2026. Author: Smart Vision Optometry.
How the eyes and brain work together
Light passes through the cornea and pupil, then the lens helps focus it onto the retina. Light-sensitive retinal cells convert it into electrical signals, which travel along the optic nerve to the brain. The brain uses those signals to create the images we see. The National Eye Institute explains this visual pathway.
Why an eye chart is only part of an examination
Distance clarity does not tell us everything about comfortable vision. For example, convergence insufficiency affects how the eyes work together at close range and can occur despite good distance acuity. It may cause tired eyes, near blur or double vision. These symptoms need assessment rather than a diagnosis based on an online checklist. See the National Eye Institute guidance on convergence insufficiency.
Describe the task that is difficult
When booking, explain whether the problem occurs with a phone, a book, a computer or distance viewing. Ask what the examination will assess and which findings explain your symptoms. Our Smart Vision Skills Assessment page outlines the service. Families can also read our related article on vision skills and learning.
Frequently asked questions
Is sight different from vision?
The words overlap in everyday use. Seeing involves both the eyes and the brain; dividing it into two entirely separate processes can be misleading.
Does 20/20 vision mean my eyes are completely healthy?
No. A visual-acuity result describes clarity at a test distance. It does not replace an examination of eye health, focusing and how the eyes work together.
What should I bring to an eye appointment?
Bring your current glasses, contact-lens details and a list of symptoms. Tell the optometrist which activities are uncomfortable and when the difficulties occur.
To discuss an assessment at Bondi or Mosman, contact Smart Vision Optometry.
