JPS627293Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tear film testing device for observing and inspecting the behavior of a tear film and a contact lens.

Tears in the eye form an extremely thin film consisting of three layers on the cornea, and play an important role in not only simply moistening the cornea, but also helping the corneal tissue breathe.
In particular, when contact lenses are worn, the behavior of the tear film that forms between the contact lenses and the cornea needs to be thoroughly observed and understood in order to elucidate the causes of corneal damage that tends to occur as a side effect. However, the amount of lachrymal fluid is too small, its chemical composition is very complex, and it has a specific adhesive effect, and the curvature of the back surface of the contact lens and the curvature of the corneal surface are too small to be absorbed by lachrymal fluid. No testing device has been used to accurately observe and examine the tear film, which affects the behavior of the tear film.

This idea was developed with a focus on the above points, and involves irradiating the entire corneal surface of the eye with chronic light, and using the reflected light from the corneal surface to control the behavior of the tear film and contact lenses above it. It is an object of the present invention to provide a tear film testing device that can observe and test the tear film.

Hereinafter, embodiments of this invention will be described based on the drawings.

Fig. 1 shows a front view of the tear film testing device, and Fig. 2 shows its longitudinal cross-sectional view. Fixed. A translucent cylinder 3 is installed horizontally in the center of the box-shaped main body 2, penetrating the box-shaped main body 2, and the tip of this translucent cylinder 3 becomes the opening 5 for the eye to be examined, and the rear end is the opening 6 for inserting the camera lens.
is formed. The translucent cylinder 3 has an aperture that can completely cover the eye to be examined, and is formed by wrapping a polarizing plate around the inner and outer surfaces of a transparent cylinder or by attaching opaque gelatin or a filter. There is. Inside the box-shaped main body 2, two annular illumination lights 4 are installed around a translucent cylinder 3, in order to irradiate the entire corneal surface layer of the eye to be examined immediately in front of the translucent cylinder with a permeating light. It serves as a light source. A video camera (television camera) 7 is installed on a base 8 with its lens inserted into a translucent cylinder 3 through an opening 6, and focuses on the surface of the eye to be examined to detect tear film and other The movement can be viewed on television.

Next, an example will be described in which the behavior of a tear film was observed using the tear film testing device having the above configuration.

Example 1 When the eye to be examined is positioned in front of the opening 5, the illumination lamp 4 is turned on, and the video camera 7 is focused on the front surface of the tear film, the eyelids are observed as the eye to be examined blinks. A thin cloud-like lipid film was observed to move upward from the lower eyelid with a delay in movement.
As a result, lipid membranes were observed to be especially dense in young people and those with homeostasis.
Furthermore, when the focus of the video camera 7 was brought slightly closer to the cornea than to the lipid membrane, movement of tear fluid could be observed as a shadow.

Example 2 When the eye to be examined uses a hard contact lens, the tear fluid around the lens adheres and exhibits a prism effect, making it difficult to clearly observe the behavior of the contact lens and tear film during blinking. can.
That is, when the eye is opened, the lens attaches to the upper part of the cornea, pauses for a while, and then rapidly descends due to lachrymal secretion and falls to the lid margin. At this time, the lachrymal fluid that has accumulated at the lid margin is pushed up onto the corneal surface by the contact lens, and some of it enters under the contact lens.

Furthermore, if the contact lens is in perfect contact with the cornea, the tear fluid on the back surface of the contact lens will not move when you blink, but if the contact lens is in moderate contact, the contact lens will move slightly and push the tear fluid out of the back surface of the lens, causing the eyes to see the eye. When opened, it was observed that tear fluid was absorbed. As a result, this test can detect and prevent accidents in which the contact lens adheres too closely to the cornea, making it impossible for tear fluid to move, making it difficult for the cornea to breathe, and causing corneal damage.

Example 3 On the inner surface of the transparent cylinder 3, as shown in FIG.
If a pattern with several rings 9 is used, a plurality of concentric striped patterns can be projected and observed on the cornea of the eye to be examined. Therefore, corneal astigmatism can be tested by observing whether the concentric striped pattern is a perfect circle or an irregular circle.

As described above, according to the tear film testing device of this invention, a translucent cylinder is installed horizontally through the center of the box-shaped main body, and an illumination lamp is installed around the translucent cylinder inside the main body. At the same time, a video camera is installed so that its lens is inserted from the rear end of the translucent cylinder, and the entire corneal surface layer of the eye to be examined, which is located in front of the translucent cylinder, is illuminated with a chronic light. Since it is configured to be photographed using a video camera, it is possible to clearly observe the tear film of the eye and the behavior of contact lenses using a simple device, and to accurately inspect contact lens defects, tear fluid, cornea, etc. be able to.

[Brief explanation of the drawing]

The figures show an embodiment of this invention; Fig. 1 is a front view of a tear film testing device, Fig. 2 is a longitudinal sectional view of the same, and Fig. 3 is a perspective view of a translucent cylinder of another embodiment. . 2... Box-shaped main body, 3... Translucent cylinder, 4... Lighting lamp, 7... Video camera.

Claims (1)

[Scope of utility model registration request] A translucent cylinder is installed horizontally through the center of the box-shaped main body, and a light-transmitting cylinder is provided around the translucent cylinder inside the box-shaped main body for illuminating the front of the translucent cylinder with pervading light. A tear film testing device characterized in that an illumination lamp is arranged, and a video camera is installed so as to photograph the front of the translucent cylinder with a lens inserted from the rear end of the translucent cylinder.