Blind mice no more

Logitech has utilized a cool technology that allows you to use your wireless mouse on any surface around the home or office. From the leather couch to the kitchen counter or lacquered tabletop, this mouse is designed to work on all surfaces. With a retail price of between $80 - $120 and I think it is a fair price for this technology.

"Beginning in 2005, Logitech – the world’s leading manufacturer of computer mice – embarked on a multiyear research and development project to create a mouse (that could be used on any surface). After considering many options – including Doppler radar, UV imaging and interferometry techniques – Logitech® Darkfield Laser Tracking was developed.

Darkfield Laser Tracking provides precise cursor control on virtually any surface – even glass. Darkfield is derived from the principles of dark field microscopy, which is used in laboratories around the world to detect the most difficult-to-see particles."

Read more at www.logitech.com and check out an excerpt from the Wiki page below...

Dark field microscopy is a very simple yet effective technique and well suited for uses involving live and unstained biological samples, such as a smear from a tissue culture or individual water-borne single-celled organisms. Considering the simplicity of the setup, the quality of images obtained from this technique is impressive.

The main limitation of dark field microscopy is the low light levels seen in the final image. This means the sample must be very strongly illuminated, which can cause damage to the sample. Dark field microscopy techniques are almost entirely free of artifacts, due to the nature of the process. However the interpretation of dark field images must be done with great care as common dark features of bright field microscopy images may be invisible, and vice versa.

While the dark field image may first appear to be a negative of the bright field image, different effects are visible in each. In bright field microscopy, features are visible where either a shadow is cast on the surface by the incident light, or a part of the surface is less reflective, possibly by the presence of pits or scratches. Raised features that are too smooth to cast shadows will not appear in bright field images, but the light that reflects off the sides of the feature will be visible in the dark field images.