Modification of a 32 G Needle as an Eyepiece Pointer for Light Microscopy

Technological Challenge

Dermatopathology can bring out the inner ”Sherlock Holmes” of residents, as they make microscopic observations to reach to a definitive diagnosis.[1] To enhance proficiency in dermatopathology, interaction between residents and their mentor is indispensable for the learning process. Consequently, an eyepiece pointer under the light microscope serves as an important tool to point out various findings essential for making a diagnosis.[2] However, for some light microscopes, the pointer is not built-in but entails additional cost. Herein, we describe the use of a 32 G needle as an improvised eyepiece pointer for light microscopy.

Solution

The shaft of a 32 G needle is separated from hub and is bent at 90° at a point 1 cm from bevel end [Figure 1a]. The base of this shaft is simply stuck to the inner wall of the eyepiece such that the bevel end is present at the center of the eyepiece which will function as a pointer [Figure 1b]. The subject of interest to be visualized and demonstrated in the field of view can be adjusted and placed next to the pointer. This simple modification will serve as a useful adjuvant to point out specific structures under the microscope [Figure 2].

Figure 1.

(a) 32 G needle bent at 90° (b) Needle shaft stuck to the inner wall of the eyepiece such that the bevel end is present at the center

Figure 2.

Needle pointer focusing on medulla of the hair shaft as seen through the microscope

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.