Joint Commission International
Accredited Hospital
Certfied and
Internationally Trained
Doctors in 9 Specialties
Comprehensive Ophthalmology
Cao Thang Eye Hospital offers 3 different types of eye examination packages:

The purpose of the general eye exam is to determine whether your eyes are in a good condition and to prevent risks of any refractive errors like myopia, hyperopia, astigmatism or even presbyopia.

In many cases though, the doctor can diagnose and detect many signs of early stage common acute eye diseases, that may result in vision loss permanently like: glaucoma, retinal detachment etc. (afterwards the doctor may request more intensive tests correspondingly). Cao Thang Eye Hospital offers 3 different packages regarding to eye examinations.

1. General eye examination:

• Visual Acuity test
• Refraction test
• Intraocular Pressure test (IOP).
• Consultation with the ophthalmologist.

2. Refraction test (prescription for glasses or contact lenses):

• Visual Acuity test
• Consultation with the optometrist/optician

3. Eye examination (test for diseases, symptoms like blurry vision, redness, discharge etc.):

• Visual Acuity test
• Intraocular Pressure test (IOP)
• Consultation with the ophthalmologist

Visual Acuity Test

Cover Test
Patient taking a cover test

Snellen Chart

Visual acuity is literally the sharpness of your vision. The doctor will measure your visual acuity by your ability to identify letters or numbers on a Snellen chart (see image on the right) from a specific viewing distance. During this test the doctor will ask you to cover one eye up while you try to read the Snellen chart.

With this method the doctor can assess if the uncovered eye must move to focus on the target objects. If so it could indicate strabismus or a more subtle binocular vision problem that could cause eye strain or amblyopia (“lazy eye”). Major physical and neurological factors determine visual acuity:

1. How accurately the cornea and lens of the eye focus light onto the retina
2. The sensitivity of the nerves in the retina and vision centers in the brain
3. The ability of the brain to interpret information received from the eyes

Refraction Test

Refraction Test Foreign Patient

Refraction test and cover test. This test will determine the exact eyeglass prescription. The refraction test will determine your level of hyperopia (farsightedness), myopia (nearsightedness), astigmatism and presbyopia.

Intraocular Pressure Test

Intraocular Pressure test

During a intraocular pressure (or IOP) test, a tonometer is used to measure the pressure inside your eye. Your eye will be numbed with eye drops, and a small probe gently rests against your eye’s surface.

If you have high eye pressure (high IOP reading), you may be at risk for or have glaucoma. High eye pressure indicates a problem with the amount of fluid inside your eye. Either the eye is producing too much fluid, or it’s not draining properly.

Consultation with the ophthalmologist

Dr Trang & Hamlet Truong

During consultation the doctor will perform a slit lamp examination (binocular microscope) to examine the structure of the front of your eyes under high magnification like: eyelids, cornea, conjunctiva, iris, and lens.

A wide range of eye conditions and diseases can be detected with the slit lamp exam, including cataracts, macular degeneration, corneal ulcers and diabetic retinopathy, etc.

Comprehensive Imaging

Cao Thang Eye Hospital’s Comprehensive Imaging service is managed by a team of fully-accredited ophthalmology specialists. Dr. Nguyen Dung, assisted by experienced optometrists and support staff, heads the Service and performs the following procedures below.

OCT for Macula and Glaucoma

OCT (Optical Coherence Tomography) is a medical imaging technique that captures three-dimensional images of biological tissues using near-infrared light.

This procedure is widely used to assess macular degeneration, thanks to the high-resolution images of the anterior segment of the eye and of the retina that it provides.

This procedure has also proved reliable to monitor the progression of glaucoma

OPD Scan: Intraocular Lens Calculation for Cataract Surgery

A wrong power calculation results in unsuitable output for the patient.

Cao Thang Eye Hospital’s Imaging Service aims at maximizing the success rate of operations and does so by using the best biometrical technologies.

Cao Thang Eye Hospital uses the most-cutting edge OPD Scans to ensure that the implantation of an Intraocular Lens (IOL) following a cataract removal is tailored for the patient’s eye.

Angiography, an Eye Blood Vessel Imaging Procedure

Angiography – or Fluorescein Angiography – is an eye examination intended to picture the blood vessels within the patient’s eye. It is not an x-ray procedure, therefore no radiations are involved.

It allows doctors to check the blood flow within the patient’s retina and to look for abnormal vessels (swelling, etc.) and tumors. Patients with high blood pressure, diabetes, sickle-cell anaemia are at risk and necessitate such examinations.

It is performed with a dye that is injected in the patient’s arm. This dye will enable the camera to take pictures of the blood vessels in the patient’s eye. The examination is completed within a short time and causes little if any discomfort.