Eye Operation Mechanism

1. Parts Of The Eye

The eye is divided into two parts: anterior segment and posterior segment.

The anterior segment consists of parts that can be examined with simple instruments such as a flashlight or magnifier:

• Eyelids and eyelashes: The eye is closed or opened via the operation of the two folds of skin called eyelids. There are eyelashes on the eyelid, which protect the eye from foreign objects. The eye closing-opening action keeps the eye from infection with factors such as smoke, dust, water, etc.
• Conjunctiva: a thin membrane covering the white part (sclera) of the eyeball containing blood vessels. It mainly keeps the tear layer stable and secrete certain substances in the tear to prevent any penetration into the cornea.
• Sclera: the outermost layer of the eyeball, which forms the eye shape (sphere)
• Cornea: has the dome shape, is the most curved and transparent part. It acts as a lens, focusing images on the retina, helping us to see objects.
• Iris is the pigmented ring that surrounds the pupil. It determines the eye color (black, brown, blue, etc.)
• Pupil: a small black hole in the center of the iris. It can be contracted or expanded thanks to muscles in the iris that regulate the amount of light that enters the eye.

The posterior segment consists of parts that can only be examined by specialized means:

• Aqueous humor: is the fluid secreted from the ciliary body. It fills both the anterior chamber (the space between the cornea and the iris) and the posterior chamber (the space between the iris and the lens), provides nutrients to the cornea and lens and creates a large influence on the intraocular pressure to maintain a stretched spherical shape for the eye.
• Lens: is the transparent structure suspended behind the pupil that helps to focus light on the retina when light passes through the pupil.

The retina is the innermost layer of the eyeball. When it receives light, it will transmit signals to the brain via the optic nerves, and the brain will give us the knowledge of objects that we see. The eyes are considered the most beautiful and modern camera in the world. The eye captures images similar to the way the camera does

2. Eye Operation Mechanism

The eyes are considered the most beautiful and modern camera in the world. The eye captures images similar to the way the camera does. To capture an image, the light reflected from the object is refracted through the lens system and focused on the film. The light signal causes chemical reactions in the film, producing pictures through photo-making. Likewise, the eye has a “lens” system consisting of cornea and lens. After being refracted through the cornea and lens, the light will focus on the retina. Photoreceptor cells on the retina will convert the light signal here into neural signals. That signal is then transmitted to the brain via the optic nerves and identified as imaging in the brain. This is how the eye works to see something. For the camera, we have to adjust to obtain precise focus and light level for sharpness, clean the dirty lens, and maintain it carefully. Our eyes perform those tasks entirely automatically. For example, our lens will change its curvature, controlled by the ciliary muscles, to change focus. Adjusting the iris’ elasticity shall result in changes in the pupil’s size, which contains the intensity of the incoming light beam. The primary and auxiliary lacrimal glands work to keep the cornea lubricated. This natural cleaning and protection mechanism is bestowed on the eyes by nature. These operations occur automatically under the highly sophisticated control of neural mechanisms, which no high-end camera can match.

Our Ophthalmologists

• Dr THAO Vo, Chief Medical Officer , Prima Medical Center Saigon
• Dr AN Trinh, Head of General Ophthalmology
• Dr BINH Tran, Senior Consultant
• Dr TRAN Nguyen, Consultant

Prima Saigon is one of the prestigious eye hospitals in Vietnam, recognized by the US embassy in Vietnam. If you need an eye assessment, please have a visit to Prima Medical Center Saigon

• Address: 27 Ky Dong St, District 3, HCMC
• Website: https://primahealth.vn/en/
• Business Hours: 07:30 – 17:00 from Monday – Saturday
• HOTLINE: 0919-209-039 or 1900 – 9115

Prima Saigon recommends that clients should reserve their intended consultation at least three days before their visit for convenience and less waiting time.