For hundreds of years, the basic structure of the microscope has remained pretty much the same. However, constant improvement has added functionality. Experts noted the most recent improvements in microscope technology. The biggest improvement in microscopes is the change from fixed tube length to infinity-corrected optics. In the past, microscopes had a fixed optical length of about 160 mm from the objective lens to the eye. This meant that light had to hit the object at just the right angle and distance from the lenses or the user would not get a clear picture. In simplest terms, infinity-corrected lenses enable the light to emerge parallel or focused to infinity, within the microscope. Plus, within this parallel range of light, devices such as beam splitters, polarizer and prisms can easily be added without the user losing optical quality. Another improvement is the quality of lenses. Now, with computers designing the lenses and computers controlling the machines that actually make the lenses, they are better than ever before.

This has paved the way for brighter, clearer imaging. The digital age is having an influence everywhere. We now have the ability to take images from a microscope and input them into a computer where you can work with measurements. The more and more microscopes will include video and digital capabilities, there is going to be higher resolution, digital output and software integration. One area of microscopes that has been a continuous issue is the ergonomics of the systems. Simply put, it is tiring on the eyes, neck and back to stare into an eyepiece all day long. Many traditional microscopes now have a tilting head feature that can be adjusted depending on where the user is seated, the height of the bench or the angle of the head. Even though ergonomics have improved, over time most experts agree there’s a long way to go. With the issue of ergonomics in mind, microscopes at Vision Engineering Inc. have been designed with a special focus on user comfort. The optical image that the user would normally see through eyepieces is instead projected onto a screen. Unlike a video system, this image is not electronically reproduced but is an actual representation of optical image of the microscope. You get the resolution of a microscope with the fatigue-free view of a video system.

It is much more ergonomic than a traditional microscope. There are three common optical techniques used with microscopes. The Brightfield which directly illuminates the observed part, the Dark field which technique does not admit light directly to the objective. It is used to examine specimens that can not be distinguished from the background, and the Differential interference contrast that is a polarized-light technique. It yields an image with a shadow relief, so that variations in optical thickness appear as variations in the brightness of an image. It is often used to examine semiconductors, where it is difficult to develop contrast between patterns. This technique can give a 3-D look to a very two-dimensional part. The developer of video microscopes, Hi Scopes System, manufactures equipment that is slightly different from traditional microscopes in that there is no human eye involved in the optics. Instead, the optical path consists of a hand-held or mounted device that is held up to an object that is projected onto a video monitor. Normally, data collection is accomplished through a screen-capture feature, which can be translated into an electronic file. The file can be incorporated into software programs that take measurements of the part. Or, the video monitor itself can be equipped