The principle and function of the optical magnifier

[Optical Magnifier] Principle of Optical Magnifier Type and Function of Optical Magnifier

1. Hand-held magnifier

The hand-held magnifying glass is compact, lightweight, inexpensive, portable, and adaptable. Hand-held magnifiers come in a wide variety of shapes, from circular to square in shape; from the structure, there are handles, folding and built-in light sources.

(1) Main features:

1 The magnification is flexible, and the magnification can be changed according to the distance between the reading and the magnifying glass, and the user can conveniently and arbitrarily make limited adjustment.

2 The higher the magnification of the magnifying glass, the smaller the range that can be seen. In order to obtain a larger field of view, the closer the eye to the lens is, the closer it is.

3 The mirror holder can use the space between the magnifying glass and the reading object for writing and other work.

4 Hand-held magnifiers are commonly used because of their portability and ease of use.

5 built-in light source handheld magnifier often uses a small battery as a power source, which can be free from the limitation and influence of the brightness of the surrounding environment, and is flexible and convenient to use.

(2) How to use:

1 Place the magnifying glass on the reading first, then slowly increase it until the contents of the reading appear the clearest and the surrounding image is not deformed.

2 Keep the proper distance between the magnifying glass and the reading and move them closer or further together to select the most satisfactory field of view.

3 The most difficult thing to read is that the mirror holder is unstable and causes visual fatigue. You can place the mirror holder on the reading object or place the mirror arm on the table.

4 Many low vision people like to put their eyes on the magnifying glass when reading, in order to get the maximum magnification and maximum field of view.

5 Adjust the position of the light source to avoid the shadow of the body and the magnifying glass from obscuring the reading object, and avoid reflecting and collecting light on the reading object.

6 built-in light source handheld magnifier generally uses a small battery, battery capacity is limited, so they are designed with flexible switches, easy to use.

2. Glasses-type optical magnifier

A glasses-type magnifying glass, as the name implies, is a magnifying glass that can be worn on the eyes like glasses. Spectacle-type optical magnifiers are divided into: single-lens glasses, bi-optic glasses, half-cut glasses, and single-lens magnifiers mounted on glasses.

(1) Main features:

1Because the glasses-type magnifying glass can be worn on the eyes, the hands can move freely and carry out some work that is farther away, such as writing, typing or manual operation. But it is not convenient to look at something very close.

2 The advantage of double light and half glasses is that you can see the scenery at different distances at the same time. For example, the glazing of the bifocal glasses can easily read the headline of the newspaper; and the grading of the larger magnification can conveniently read the small characters.

3 Using a glasses-type magnifying glass, although the distance between the eyes and the reading object will be very close, but because of the wide field of view, many people with low vision like to use the glasses-type magnifying glass as a reading tool.

(2) How to use:

1 Move the object closer or farther and adjust to the focus of the reading lens to make the object image clearest.

If you are unable to read properly, you can use your finger or black ruler to help guide.

3 People with low vision who have serious visual defects can use the reading ripper to enhance contrast and reduce glare.

4 When reading, it is best to choose a light source with adjustable illuminance and variable projection angle to avoid direct light from the human eye.

5 To avoid shadows on the head and body from obscuring the reading, and to avoid specular reflection of light.

3. Vertical optical magnifier

A vertical magnifying glass refers to a magnifying glass with a "frame" or a "foot" at the bottom that can be placed on the table. Vertical magnifiers vary in size, some are small and exquisite, some are thick and bulky; some have built-in light sources, and some have no built-in light sources. Larger lenses, also known as desktop magnifiers, are relatively bulky and less flexible to use, but have a wider field of view and a larger viewing area.

The distance between the general vertical mirror lens and the reading object is fixed, and the focal length is also fixed, so the user needs to have sufficient adjustment ability, or use suitable close glasses or bifocal glasses. There are also vertical magnifier brackets that are adjustable in length and length, and the focal length can be fine-tuned.

(1) Main features:

1 The lens of the vertical magnifier can be designed to be larger, and the larger the lens, the larger the range of magnification, so the reading is more comfortable.

2 Because the distance between the vertical magnifying glass and the reading material is basically fixed, the vertical magnifying glass with high magnification is easier to use than the handheld magnifying glass with high magnification, especially for the first time.

3 vertical magnifiers must be placed on a flat surface, thus limiting the flexibility of use.

4 When using a vertical magnifying glass, the distance between the eyes and the reading object is farther than that of the glasses and the hand-held magnifying glass, and has a more comfortable reading posture, which is particularly suitable for the elderly.

(2) How to use:

1 The vertical magnifying glass should be placed on the table that is tilted toward the reader. The reader will feel more convenient, more labor-saving and more comfortable, and will not feel tired even if reading for a long time.

2 Vertical mirrors with different magnifications have different fields of view. The distance between the reading object and the lens is also different. Users should choose the vertical mirror that suits their own vision and willingness.

3 Try to change the distance between the eye and the magnifying glass surface and choose the most satisfactory field of view.

4 When using a vertical magnifier without a built-in light source, you need to select the direction, angle and brightness of the light source, avoiding shadows and reflected light to get enough light.

5 Some people wear suitable glasses and then use a vertical mirror or a desktop mirror for better effect and easier use.

4. Magnifying glass group

The German Schwed Optical Magnifier has the following main features and functions:

1 A total of 2.5 times, 3 times (including round and rectangular), 4 times, 5 times, 6 times, 8 times of various optical magnifiers.

2 Two lighted lamp handles, one for battery carrying and one for fixed power at home.

3The handle base with double-sided lens overlap and enlargement, it is unique in the world, and its base can be converted into three angles.

4 With three filters, ready for use (orange, blue and transparent), it is very convenient for visually impaired people with color blindness and omental defects.

5 The product is sold with a tray and a suitcase for easy storage and carrying.

5. a variety of magnifying glasses

(1) Flat-type magnifying glass:

(2) Folding desktop magnifying glass: