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Physiology of the human eye

Questions
 
True
False
1

Light refraction is the key to how the eye creates vision. It starts by light entering the eye through the cornea, which acts as a clear, protective outer covering of the eye.

Explanation:

Light refraction is the key to how the eye creates vision. Light enters the eye through the cornea, which acts as a clear, protective outer covering. The cornea bends or ‘refracts’ the light towards the pupil, which is the black circular opening in the center of the iris.

2

The iris is the colored part of the eye, which adjusts the size of the pupil to regulate the amount of light entering the eye. In bright light, they iris gets smaller, in darkness the iris gets larger.

Explanation:

The iris is the colored part of the eye, which adjusts the size of the pupil to regulate the amount of light entering the eye. In bright conditions, it contracts to reduce the pupil size which restricts too much light from entering the eye, and in dim conditions, it dilates to increase the pupil size which allows more light in, giving you better vision when it’s dark out.

3

The lens is a flexible disc shaped structure that allows the eye to focus the light directly onto the retina. Small muscles attached to the lens are what changes the shape of the lens.

Explanation:

Beyond the pupil lies the lens which is a flexible, transparent structure that further refracts light to focus it precisely onto the retina. Muscles attached to the lens can change its shape

4

The cornea and the lens form inverted images onto the retina. The brain automatically inverts the image so we see things correctly.

Explanation:

Light focused by the cornea and lens forms an inverted image on the retina. Once the brain receives the image, it automatically inverts it again so that we see things correctly.

5

The cornea has an inner surface that contain photoreceptors called rods and cones that convert light into electrical signals.

Explanation:

The retina lines the inner surface at the back of the eye and contains millions of photoreceptor cells called rods and cones that convert light into electrical signals.

6

The rods and cones in the retina change shape when they are exposed to light. This change causes a cascade of chemical and electrical signals, which generates nerve impulses to travel to the brain.

Explanation:

Rods and cones contain light-sensitive pigments (like rhodopsin in rods and opsins in cones) that change shape when exposed to light. This change triggers a cascade of chemical and electrical signals, ultimately generating nerve impulses that travel to the brain for interpretation.

7

Binocular vision is a function of how the brain itself manipulates the images coming in.

Explanation:

how the human eyes are placed in the skull allows for binocular vision. This is where each eye sees a slightly different image. This disparity helps with depth perception and spatial awareness.

COVID-19 Update For our current COVID-19 procedures, please click here for more information. We will also be offering alternatives to reduce in-person visits, including telehealth video appointments with your doctor, and our online platform for purchasing contact lenses and dry eye products online. Please note ALL CONTACT LENS SHIPPING IS CURRENTLY FREE as our way of saying thank you for supporting us! FOR TELEHEALTH: If our staff or doctors have directed you to sign our Telehealth Consent Form, please click here. FOR VISION THERAPY PATIENTS: Please contact us at visiontherapy@familyeyecarecentre.com or call us at 250-383-2411. Drs. Judith LeRoy, Nazima Sangha, Darcy Dennis, and your Family Eyecare Centre Team Who We Are Have you heard about Sightly? Did you know that we have a website that where you can order your Contact Lenses? It’s like online shopping for your Contacts! If you want to order online, click the ‘Order Products/Lenses’ button and then order your brand of contact lenses. By using this method, you can pay online and even ship the lenses directly to your house. If you don’t like this idea or have tried it out and it isn’t your cup of tea, that’s totally fine just send us an email info@familyeyecarecentre.com or call us at 250-383-2411. We will put your Contact Lens order through, and you can come to our office to pick up and pay for the lenses.

EYE HEALTH EXAMINATIONS
Our doctors are continually educating themselves and keeping up with the latest in modern technology so that they can offer you thorough and comprehensive examinations. The full eye health examination will vary from patient to patient depending on the health and age of the individual and their visual needs.

We are pleased to inform you that we have the latest diagnostic procedure called FDT. FDT detects changes in the visual field caused by glaucoma, optic neuritis, macular degeneration, strokes and certain brain tumors. Undetected, glaucoma and macular degeneration can lead to blindness. Protect your eyes and their visual health by seeing your Optometrist... what could be more important!

Family Eyecare in Victoria is excited to have expanded our already extensive use of new technology. We now have a retinal camera to record images of the back of your eye, as well as new technology for glaucoma testing. Retinal photography allows us to keep a computerized image of the back of your eye in your computer file and allows us to monitor any changes from this baseline over time. Retinal imaging is an important part of modern eye care and we are pleased to make the investment in this technology in order to serve you better.

If your examination indicates a need for further testing such as a topography or field test we are able to perform these tests in our office eliminating the need to refer you to another office.

EXAM FEES
Until November 18, 2001, all residents of B.C. were entitled to free routine eye examinations. As of November 19, 2001, MSP no longer covers examination fees for patients within the ages of 19-64, and only pays a portion of the exam fees for seniors or children above the age of 10 years old. Eye health emergencies and supplemental testing requested by the Doctors may be partially covered through your medical services plan.
*Please note that there is no coverage at all for contact lens appointments.

  • Children 1-9 years: Free & recommended once a year
  • Children 10-18 years: $20 & recommended once a year
  • Adults 19-39 years: $93 & recommended once every 2 years
  • Adults 39-64 years: $103 & recommended once every 2 years
  • Seniors 65+ years: Discounted fee of $46 & recommended once a year

*Other types of exams: Please ask our receptionists for details until our site is further updated

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