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Common Inspection Method Of Slit Lamp
Sep 08, 2017

1) Dispersion lighting method: is the slit lamp commonly used to view the way, the illumination light source oblique projection, projection investigation angle 45 ° (30 ° ~ 50 °), the light source plus frosted filter, and full open large fissure, In a diffuse lighting situation. With high brightness, low magnification microscope to investigate.

This is the most commonly used method of viewing, this method is often used in the immediate section of the rapid start to see, including the eyelid, conjunctiva, tear film, cornea, sclera, anterior chamber, iris, pupil, lens, etc., is the best way to see corneal edema , The wide beam on the cornea around the cornea edema surface in the cornea center gray. Such as the discovery of lesions and then change the other way to view. Together can also be used for soft corneal touch mirror, hard corneal touch mirror with the evaluation. This approach is mainly to see the eye color and shape changes to determine the lesion.


2) Direct shine law: This method is the foundation of the slit lamp microscope. Its fundamental feature is the fissure light and the focus of the microscope coincides. The light source is projected from the left or right side into the corneal arrangement from 40 ° to 65 °, and the fissure is adjusted to a very thin width to form a "light knife", and the focus of the microscope is projected onto the arrangement so that the arrangement is finely investigated. With medium to high brightness, medium to high power microscope to investigate.

The focus of light and the eyes after the touch, the optical effect depends on the light through the arrangement of transparency. If the focus of light falls on unobtrusive arrangements, such as scaba and iris, it is reflected and absorbed by most of the light, and gets light and regular shines. But if the focus of light through a clear and lax light interstitial such as cornea and lens, it constitutes a milky white optical parallelepiped. This is so, because the cornea or lens in the diffuse light, although it is transparent, but by the messy cells, still attributed to uneven media. When the light through the period, due to the arrangement of the internal structure, can make the light attack reflection, inflection and lax, and finally in the cornea or lens on the composition of the milky white optical parallelepiped.


Wide light: If the crack is relaxed to 1mm (that is, half the width), known as wide light to see in the use of diffuse light exposure method with low magnification seen the lesion, or found that never seen the disease The Can all investigate the curvature of the cornea, thickness, corneal ulcers, corneal ulcers, corneal foreign body, corneal calm matter, pupil, iris and other levels, shape and disease.


Narrow light shines: If the cracks are reduced, the optical parallel hexahedrons are narrowed together before and after the two sides, but the thickness of the front and back, that is narrow light, when reduced to 0.5mm below, you can into the optical section. This method facilitates the determination of lesion orientation, resolution of corneal trauma is not for penetrating, and the investigation of other detailed lesions. As the light is weak, in order to achieve a better view, the viewer's eyes need to be in the dark habit of the situation.


Cone Light: This method uses a very small round hole to replace the usual use of the cracks, which small round hole declared conical light. When the conical light shines into the anterior chamber, the most mild aqueous humor can also be seen in the water can be seen in the floating particles. Use this method to view, the darkroom should be extremely dark, viewers in an excellent dark habit conditions, no one should see this detailed change. Operation, the slit lamp length to a minimum, the widest width, high brightness, medium to high magnification to investigate. In the investigation, the focus will be on the iris, investigate the situation of aqueous humor.


3) Rear Reflective Illumination: Reflected by the back of the light back to see the bright, semi-clear, normal and pathological arrangements, see the slit light when the focus on the rear of the direction of the inconvenient arrangement or reflective surface , And the focus of the microscope is adjusted to the surveyed arrangement, using the reflected light that occurs on the iris, lens, or retina, and the corresponding front arrangement is investigated. When investigating the front of the lens, the focus of the light should be shining on the posterior capsule of the lens or using light from the fundus. Direct rear reflective lighting method, that is, the arrangement of the arrangement just sitting on the road reflecting the light. Clinically used to investigate the posterior wall of the cornea, corneal epithelium or corneal endothelium edema, corneal deep foreign body, corneal regenerative blood vessels, corneal fibrous scar. Such as the light source of the slit light shines on the posterior capsule of the lens, the use of its reflective can also investigate the lens of the fine vacuoles and iris atrophy, cataract and so on. Direct rear reflection light method, that is, the arrangement is arranged to reflect the light on the side of the road, with no light of the area for the scene to investigate. Can view the corneal moisture, corneal folds, etc., can also be used to view the corneal touch mirror lens sediment, such as protein sediment and so on.

In the use of rear reflective light law, the lesion with the background reflective color is not the same and show a different color. Such as lens vesicles, when the lens after the retroflex when the lens was blue-gray, and the fundus for the scenery, it was yellow red.


4) Mirror Reflective Method: Use the illuminated light in the cornea or the appearance of the lens surface of the external reflective area, with the direct focus of the optical parallel to the hexahedron coincidence, by the region to enhance the brightness, and check the arrangement of the place. At the moment was shining reflective with brilliant, like reflective mirror, hence the name for the mirror reflective law. Use this method, to see the cornea on the surface of the tear film on the drop cells, corneal endothelial cells inlaid shape and the lens before the anterior and posterior capsule and adult nucleus markings and so on. The need to note that this method requires a monocular survey.


5) corneal margin of light shine law: also known as corneal edge scattering lighting method. This method is the use of the cornea of the transparent function, the first slit light directly projected on the limbus, the light in the cornea arrangement constitutes a total reflection in the corneal limbus to form a circular halo, and then focus on the microscope gathered in the cornea, Can clearly show the corneal arrangement of the transparency of the situation to the contralateral limbus at the most clear. In normal, in addition to the sclera edge of the cornea and a ring shadow (formed by the scleral protrusion), the cornea itself will be nothing. But if the cornea somewhere cloudy, where the visible gray shade. Corneal edge light illumination method is suitable for viewing the corneal slim changes, commonly used to view corneal sediment, corneal moisturizing, corneal blisters, corneal blood vessels, corneal edema and corneal scar and other lesions can also be used to view the corneal lens lens.


6) Direct shining law: This law is to light the light to the arrangement of some of the light in the arrangement of the lax, inflection and reflection, in the shine near the shade to distinguish. At the moment the focus of the microscope and the illumination of the light that the focus of the light is not together, the focus of light on the shade. This method can also be said that the corneal margin of the sub-light illumination method and the rear reflex method of the joint use. The incident light and the investigation line point of view to be large, and gradually move the light will help to investigate. This method can be used to view the iris bleeding, iris blood vessels, corneal blisters and blood vessels. But also by shining close to the pupil of the iris to investigate the pupil sphincter.


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