Colored contact lenses are used to change the eye color. One of the advantages with colored contact lenses is that even people without visual problems can use colored contacts. Through the location of a little opening in the lenses the surroundings of the user are not influenced in any way. Opaque and tinted are the most commonly used types of colored contact lenses.

Colour Multiparameter Monitor is a patient monitor that draws cardiograms and measures blood pressure.

A colposcope is a large, electric microscope that is positioned approximately 30 cm from vagina. A bright light on the end of the colposcope makes it possible for physician to visualize cervix. It provides a maximum of information and confidence for gynecological diagnosis. Generally the simplest colposcope is a single convergent lens system, having magnifications fixed at x10-16 and is changed only by changing the eyepiece. Other colposcopes have variable magnifications, ranging from around x6-40. Low-power viewing (x6-10) allows rapid evaluation of the cervix, vagina and vulva, or complete visualization of most large lesions. Higher-power magnification (x10-6) permits visualization of more detail on the surface epithelium and vasculature, and enhances the colposcopist's ability to grade lesions. The highest-power magnification (x20-40) allows detailed analysis of vasculature, as is sometimes necessary for identification of high-grade neoplasia and early invasive lesions.

Colcoscopy is a medical diagnostic procedure to examine an illuminated, magnified view of the cervix and the tissues of the vagina and vulva. It is used to detect many premalignant lesions and malignant lesions through examination. It also prevent cervical cancer by detecting precancerous lesions.