What is Brightfield Microscopy Header

What Is bright field microscopy?


Bright field microscopy is one of the oldest and most widely used techniques among researchers and medical experts. The image in a bright field microscope is formed with the help of the light that goes through the specimen and forms the light image against the dark background. The microscope has helped in the discovery of cells, microorganisms, viruses, and cancer, and it has also been used in the development of genetics. Some of its advantages are its simplicity and versatility, viewing detailed images, its non-destructive technique, and compatibility with other techniques. This article will tell you more about the microscope and its advantages and limitations.


One of the oldest and most used techniques in microscopy is bright field microscopy. It allows for the observation of living cells, tissues, and other biological specimens for educational and research purposes. The name “bright field” refers to the fact that the image is formed with “the help” of the light that goes through the specimen and forms the light image against the dark background. This technique has also been used to explore many topics in biology and medicine. The basic principle that bright field technology uses is simple; the equipment is not expensive; and it allows for an observation that won’t harm the quality of the specimen. In general, bright field microscopy can be used in the cell, tissue, and other biological specimen research, but it can also be very helpful in the observation and research of non-biological materials such as diverse types of minerals and metals.

Living organisms through a microscope
Living organisms through a microscope (left to right – plant, blood, diatomite, human tissue)

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Easy and Simple Technique

The researcher or medical expert usually needs a light source, a condenser lens, an objective lens, and an eyepiece lens. Typically, a halogen lamp serves as a light source. The light is directed through the condenser lens, which focuses the light on the specimen. The objective lens is located under the specimen. They magnify the image and project it upward through the eyepiece lens. They further magnify the image for the observer.

Principle of brightfield microscopy
Principle of brightfield microscopy

What are the various applications of brightfield microscopy?

Bright field microscopy was instrumental in important discoveries. Some of the discoveries include:

  • Discovery of Cells: Thanks to the invention of the microscope by Anton van Leeuwenhoek in the 17th century, it became possible to observe and research cells. That led to the development of bright field microscopy and cell theory in the 17th century, one of the fundamental theories in biology.
  • Discovery of Microorganisms: Bacteria and protozoa were some of the microorganisms observed and studied by using bright field microscopy. These microorganisms were previously invisible to the naked eye. This led to a new knowledge base about the role of microorganisms in diseases and the development of biology in general.
  • Discovery of Viruses: Viruses, even smaller than bacteria, were thought to be non-living. Using bright field microscopy it was possible to study and observe these microorganisms and better understand viruses in diseases.
  • Organelles: The technique of bright field microscopy was also used to study the internal structure of cells, known as organelles. Using bright field microscopy, researchers became familiar with mitochondria, the nucleus, and the endoplasmic reticulum. Bright field microscopy helped researchers understand the role of organelles in cell functioning.
  • Development of Genetics: Bright field microscopy greatly influenced the development of genetics. It allowed researchers and medical experts to observe chromosomes, the genetic material of cells. The development of genetics led to a better understanding of the role of genes in the studies of inheritance and traits.
  • Discovery of Cancer: Bright field microscopy made it easier to better understand the causes and structure of cancer disease. It also helped to develop the treatments like chemotherapy and radiotherapy.
A normal male karyotype
A normal male karyotype containing 22 pairs of autosomal chromosomes and one pair of sex chromosomes. (Source: National Cancer Institute (https://www.cancer.gov))

When we see all these discoveries, it’s easy to conclude that bright field microscopy is a fundamental tool in biology and medicine that helps in better understanding of the organisms at the cellular and molecular levels.

Brightfield Microscopy: Advantages

Bright field microscopy is known for its simplicity. No special dyes or stains are needed, and no special equipment is needed. As a result, the technique is inexpensive and easily accessible, making it ideal for use in educational and research settings.

Other Advantages Include

  • Detailed Images: High-resolution images, ideal for detailed observation.
  • Versatility: Bright field microscopy can not only be used with diverse biological materials like tissues, cells, and other specimens but also with non-biological materials like minerals and metals.
  • Non-destructive Specimen: It uses a non-destructive technique, which means the specimen is not damaged or altered during the imaging process. Additionally, the specimen can be studied multiple times.
  • Availability: Brightfield microscopy techniques require simple and inexpensive equipment. It is easily accessible by researchers and educators.
  • Compatibility with Other Techniques: The technique used in brightfield microscopy can be easily combined with others like fluorescence or electron microscopy if the researcher or medical expert needs to obtain a higher quality of images or get more data from the specimen.
Advantages of Brightfield Microscopy
Advantages of Brightfield Microscopy

What Are the Limitations of Brightfield Microscope?

However, there are a few drawbacks as well. One of the main disadvantages of bright field microscopy is that it cannot detect structures or molecules that don’t absorb or scatter light. It can also be difficult to distinguish between different structures that are located at different depths within the specimen. This can be quite problematic when working with transparent or semi-transparent samples. To overcome the disadvantages, several variations of bright field microscopy have been developed. One of the most widely used is phase contrast microscopy, first used in the early 1930s. The contrast microscope uses a special lens to increase the contrast between transparent and semi-transparent specimens. There is a phase shift in the light passing through the specimen.

Darkfield microscopy has been used since the early 20th century. It is another variation of bright field microscopy that has gained popularity in recent years. The light source does not directly illuminate the specimen but instead reflects into the objective lens. An image obtained as a result appears dark, with bright spots at the place where the light is reflected off the specimen. It is especially useful when a researcher needs to observe smaller, transparent samples, or microorganisms.


Bright field microscopy is a very useful technique and very helpful for researchers and medical experts who need to observe cells, tissues, and other biological specimens. This technique is simple, inexpensive, and easily accessible, but it has its limitations. To overcome these limitations diverse variants like fluorescence or darkfield illumination were developed. Phase contrast microscopy uses a special lens to increase the contrast between transparent and semi-transparent specimens. Darkfield microscopy is especially useful for observing smaller or transparent samples. Both variants proved quite helpful in obtaining the maximum possible efficiency and work quality. Digital microscopes from PreciPoint also offer several benefits. O8 oil digital microscope and slide scanner serve as both a digital microscope and a scanner, offering completely new possibilities for your workflow.