Specialized diagnostic aids

Technology is the most important medical tool in the field of ophthalmology.

That’s why at Clínica Carriazo, we have the latest technological equipment for diagnostic aids, aiming for accurate results for future treatments or surgical and therapeutic procedures.

Our equipment

Angiograph - EIDON

What is it?

angiographer

What is it for?

Evaluate and differentiate the presence of macular edema in the retina.

Computerized corneal topographer

What is it?

Analyze aberrations through a topographic map

What is it for?

Show the curvature of the cornea.

 

Cornea OCT - OPTOVUE

What is it?

Optical coherence tomograph

What is it for?

It is a non-invasive imaging study that uses light waves to obtain cross-sectional images of the retina.

Angiography - OCT

A new non-invasive diagnostic method used to replace fluorescein and indocyanine green (ICG) angiographies.

Retinal angiography

It is a diagnostic exam in which color and black and white photographs of the retina are obtained following the intravenous injection of a photosensitive contrast medium (sodium fluorescein). It is done to diagnose diseases or problems in the retina and choroidal blood vessels. Prior pupil dilation and fasting are required..

Ocular biometry

It is the measurement of the different spaces and lenses in the eyeball using optical, ultrasound, or laser instruments. This includes corneal curvature, corneal thickness and diameter, anterior chamber depth, and axial length of the eyeball. These measurements allow for the calculation of intraocular lens power for cataract surgery.

Refractive biometry

It is the measurement of the different spaces and lenses in the eyeball using optical, ultrasound, or laser instruments. This includes corneal curvature, corneal thickness and diameter, anterior chamber depth, and axial length of the eyeball. It can be done by contact or immersion.

Intraocular pressure curve

A test to determine intraocular pressure. Elevated intraocular pressure alone does not cause glaucoma, but it is an important risk factor. Individuals diagnosed with elevated intraocular pressure should undergo comprehensive and periodic eye examinations by a professional ophthalmologist to monitor for signs of glaucoma.

Ocular ultrasound

An examination to observe the area of the eyes and their structure, as well as measure their size. High-frequency sound waves are used in the ultrasound that travel through the eye, and the echoes of these waves form an image of the eye structure.

UBM ultrasound - Ultrabiomicroscopy

UBM ultrasound allows for the evaluation of the anterior segment structures of the eye through high-resolution ultrasound images.

Electroretinogram (ERG)

Useful exams for the diagnosis of retinal dystrophies, choroidal atrophies, vitreoretinal degenerations, inflammatory conditions, circulatory deficiencies (central retinal artery and vein occlusion, diabetes), toxic retinopathies, and the detection of early signs of siderosis in cases of intraocular metallic foreign bodies.

Electrooculogram (EOG)

Useful exams for the diagnosis of retinal dystrophies, choroidal atrophies, vitreoretinal degenerations, inflammatory conditions, circulatory deficiencies (central retinal artery and vein occlusion, diabetes), toxic retinopathies, and the detection of early signs of siderosis in cases of intraocular metallic foreign bodies.

Electrophysiology equipment

A non-invasive test that allows us to assess the functioning of the retina through electrodes. The retina is a neuronal membrane that lines the back of the eye chamber and is composed of several layers. It is used to diagnose hereditary degenerative retinal diseases.

Studies with this equipment:

  • Iscev Erg Baby Flash
  • Iscev Erg Ganzfeld

Visual field study

It is the objective measurement of both central and peripheral visual function. It is indicated when intraocular pressure is at the limit (normal intraocular pressure: 10 to 20 mm Hg); when optic nerve excavation is increased; or when there are factors such as family history of glaucoma.

Color photography

This study is performed to document and analyze the optic nerve head. It is ordered when there is bleeding or significant lesions to document, and it requires pupil dilation.

Complementary studies:

  • Color photography of the fundus of the eye.
  • Color photography of the conjunctiva.

External skin photography – PANFLEX

Involves photographic documentation to assist in treatment planning, documentation of facial features, teaching, publication, and pre- and post-procedure comparisons.

Corneal hysteresis (CORVIS)

A parameter that indicates the cornea’s damping capacity. It refers to the cornea’s ability to absorb and dissipate energy, reflecting its viscoelastic properties and biomechanical integrity.

Meibography

L

Meibography is a technology that allows us to non-invasively evaluate the morphology of the Meibomian glands in vivo with little to no discomfort. It does not require prior preparation or accompaniment.

Lacrimal osmolarity

Allows for the determination of tear saltiness, which determines the health and stability of the tear film. Tear film concentration is altered in dry eyes when the amount of tear decreases, resulting in increased salt concentration.

Pachymetry

This study is ordered along with other tests to rule out glaucoma, in order to obtain an accurate measurement of corneal thickness because intraocular pressure is measured by touching the center of the cornea. Knowing the real measurement helps determine intraocular pressure.

Evoked potentials

Visual evoked potentials are neurophysiological techniques that record brain responses to visual stimuli (VEP).

 

This test is used to assess the functional state of the visual system. It records potential variations in the occipital cortex caused by a stimulus on the retina. Therefore, it can evaluate retinocortical function in children, disabled individuals, and aphasic patients. It can also distinguish between patients with psychological blindness and those with organic causes.

 

Any alteration in the visual pathway can result in abnormal VEP. This test is useful in evaluating a series of optic nerve and occipital cortex pathologies such as maculopathies, optic neuropathies secondary to demyelinating diseases, ischemic optic neuropathies, toxic optic neuropathies (alcohol, tobacco, and drugs), amblyopia, optic nerve abnormalities due to trauma and tumors, and early diagnosis of glaucoma.

Esta prueba se emplea para valorar el estado funcional del sistema visual. Registra las variaciones de potencial en la corteza occipital provocadas por un estímulo sobre la retina. Por esta razón, puede evaluar la función retinocortical en niños, discapacitados y pacientes afásicos. También puede distinguir entre pacientes con ceguera psicológica y los que la padecen por una causa orgánica.

Cualquier alteración en la vía visual puede traducirse en PEV anómalos. Esta prueba nos sirve para valorar una serie de patologías del nervio óptico y de la corteza occipital como:

• Maculopatías
• Neuropatías ópticas secundarias a enfermedades desmielinizantes
• Neuritis ópticas isquémicas
• Neuropatías ópticas por tóxicos (alcohol, tabaco y fármacos)
• Ambliopías
• Alteración del nervio óptico por traumas y tumores
• Diagnóstico precoz del glaucoma

Pupilometry

Assessment that accurately measures the contour and diameter of the pupil under different lighting conditions, helping us plan the treatment of visual defects more precisely.

Endothelial cell count

A diagnostic examination performed using a specular microscope, which captures a photograph to count the cells per square millimeter in the inner layer of the cornea called the corneal endothelium, and analyze their shape and size.

 

Endothelial cell count is useful in corneal diseases that affect the endothelium, as well as in the preoperative and postoperative stages of anterior segment intraocular surgery.

Color Test

The Farnsworth D15 test is an examination that serves to thoroughly classify color vision impairments, allowing for an exact determination of the type of color defect.

Most color deficiencies are characterized by the congenital absence or abnormality of cells that identify color and are located in the retina.

Ishihara Test

Using Ishihara charts, a visual test is carried out to detect whether the patient is colorblind.

 

The test consists of a series of color charts that display circles of randomly sized colored dots. Each chart contains a visible number for those with normal vision and an invisible or difficult-to-see number for individuals with visual deficiencies.

Osmolarity Test - Tearlab

This examination provides a rapid, precise, and painless determination of tear osmolarity as a parameter for the diagnosis, classification, and monitoring of dry eye. It is a very quick and accurate evaluation, taking only a few seconds and requiring a minimal amount of tears.

Contrast Sensitivity Test

This examination provides information about the quality of individual vision in everyday life. It is performed after determining the patient’s refraction and is useful for cases with refractive anomalies seeking to verify the true visual state of each patient.

Provocative Tonometry

Provocative tonometry (CORVIS) is an examination based on ultrasound that allows for analysis of the shape of the internal eye structures. It is often used before cataract surgery to assess the retina or when there is opacity of the media due to other reasons. There is no preparation required, and the patient does not need to be accompanied.

Simple Corneal Topography

This computerized examination measures the curvature and evaluates individual characteristics of the corneal surface. This information is necessary for patients who have undergone previous refractive surgeries before cataract surgery.

Computerized Corneal Topography

This examination involves projecting luminous rings onto the cornea, which are reflected at a known distance and can be analyzed by computer software to create a topographical map. The map uses different color scales to indicate the flatness or curvature of different zones of the cornea (anterior layer of the eye).

Elevation Topography - GALILEI

This examination captures two- and three-dimensional images of the cornea and anterior part of the eye using software and cameras. These structures are transparent and located in front of the eye, including the iris and the lens. It is also one of the required examinations for detecting Keratoconus.

Elevation Topography - SIRIUS

The Sirius device can perform two types of examinations: elevation topography, which combines rotating camera technology with Placido rings, and complete pupillometry, which allows for measuring the pupil under photopic, mesopic, and scotopic conditions, as well as dynamic measurements.

It is also one of the required examinations for detecting Keratoconus.

Scout Topography

This study analyzes corneal aberrations through a topographic map, allowing visualization of the shape and curvature of the cornea. If the patient wears contact lenses, they should be removed 4 days before the study for soft lenses and 8 days for hard lenses.

Optical Coherence Tomography Cornea

Optical Coherence Tomography (OCT) is an imaging diagnostic technique with micrometer precision that allows for three-dimensional visualization of different ocular structures. It provides valuable information for the detection and monitoring of many eye diseases.

 

Its main advantage is that it is a non-invasive technology with a resolution much higher than other techniques used in medicine, such as CT scans or magnetic resonance imaging.

 

The OCT emits infrared light, which reflects off the ocular structures and shows us layers or sections of different parts of the eye, detecting subtle alterations at a cellular level.

Optical Coherence Tomography - Macula

This diagnostic examination is similar to ultrasound and provides computerized photographic images to detect edemas, holes, macular degeneration, and retinal or choroidal tumors.

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OCT - Optic Nerve

This diagnostic examination, similar to ultrasound, provides computerized photographic images of the tissue surrounding the optic nerve. It measures the thickness of the nerve fiber layer and the Cup/Disc ratio in patients with glaucoma or suspected glaucoma.

Wavefront (COAS)

This computerized diagnostic examination analyzes the total aberrations of the eye. These aberrations decrease the quality and quantity of vision, and examples include refractive errors such as myopia, hyperopia, astigmatism, and presbyopia. There are other aberrations that cannot be measured through refractive methods or an autorefractor, and these aberrations cause symptoms of poor visual quality.

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