Among the main instruments of an ophthalmologist, the ophthalmoscope and the retinoscope cannot certainly be missing.
These are two fundamental devices for a correct eye test.There are different brands and types and it is very important for the professional who wants to carry out effective vision tests to rely on high quality products.
Let's take a look at the various types of ophthalmoscopes and their uses.
Ophthalmoscope: what it is and what it is foruse
The ophthalmoscope is an instrument that allows a doctor to examine the inside and back of a patient's eye by observing it from the outside.It is a device that is mainly composed of an angled mirror, some lenses and a light source that serves to illuminate the entire area.
With this device the professional, typically the ophthalmologist, can clearly see the retina, the optic nerve, the retinal veins and arteries,as well as detecting whether there are some problems within the gelatinous substance present inside the eye, i.e. the vitreous humor.
Everything happens in an absolutely non-invasive way for the patient, who is observed from the outside and without any contact between his visual organ and the device.
Usually,the examination carried out with an ophthalmoscope is preceded by the administration of mydriatic drops to the patient, which serve to dilate the pupil and facilitate vision of the back of the eye, and is carried out in the dark.
With this type of test it is possible to diagnose a long series of disorders that can affect the retina,its vessels and the optic disc, and in general the entire eyeball.
Two problems that, for example, impact the integrity of the eye,and which can be kept under control by an examination with an ophthalmoscope are diabetes and hypertension.
Direct and indirect ophthalmoscope
Traditional ophthalmoscopes can be of two types, direct and indirect.The direct ophthalmoscope is the one best known to most people, as well as the device most used by ophthalmologists who need to carry out an examination of the fundus of the eye. It has the shape of a small stick with a beak at one end.Inside it is composed of a complex system of lenses and a light source that allows you to carefully observe the eyeball to the end.
While carrying out a visit with this device,the patient is asked to look straight ahead while the light beam is pointed into his eye.
The indirect ophthalmoscope on the other hand is a binocular instrument which allows you to observe the back of the patient's eye with an inverted image magnified by approximately three times.It was the first ophthalmoscope to be invented, around the middle of the nineteenth century.
This time it is the doctor who wears the indirect ophthalmoscope on his head as if it were a helmet, positioning it over his eyes.It then positions itself in front of the patient and through a complex system of lenses manages to obtain a three-dimensional visualization of the retina, possibly also managing to detect its detachment,with a better and wider depth vision of the patient's eye.
In this way it is also possible to diagnose some other disorders such as cataracts.
Types of ophthalmoscopes: Heine and Parker
Among the most famous models of direct ophthalmoscopes we certainly find Heine's ophthalmoscope,like the Mini 3000 model.
It is a pocket-sized device, with a diaphragm with a fixation star and a gray filter to reduce the intensity of the illumination. It promotes exceptional vision thanks also to excellent lighting, guaranteed by halogen light.HEINE optics offer a sharp, clear image with minimal reflections, as well as 5 different apertures.
A good alternative regarding a direct ophthalmoscope can certainly be the Parker, with 2.5 volt halogen light and equipped with 24 lenses from -25 to +40 diopters,which guarantee a high quality of the returned image.
Heine Retinoscope
Another type of examination that the ophthalmologist often carries out is retinoscopy, which allows the measurement of the refractive power of an eye to be analyzed and possibly to detect errors,which cause imperfect vision or failure to focus on the retina itself. This is achieved by projecting light onto the retina through a retinoscope.The reflection of light on the retinal tissue is an excellent indicator of the patient's vision defects.
It is a very simple and common test, which can also be performed on children, and is not at all invasive.
A particularly effective model of retinoscope is Beta 200 by Heine, hermetically sealed,and equipped with a built-in polarizer filter, which eliminates internal lights and external lights for a much sharper and more precise retinal reflection.
__KEEP_0__ offers the best tools for eye testing
We have seen how the ophthalmologist needs modern and high-performance instruments,who can guarantee a high degree of precision in the analyzes they are called upon to carry out.
__KEEP_0__ has been offering a wide range of ophthalmoscopes, retinoscopes and ophthalmologist accessories from the best brands for more than 20 years,suitable for every need of the competent doctor.
A guarantee of quality that also translates into greater patient care.
