Which of the following type of cataract gives a polychromatic lustre on examination of the eye by the instrument shown in the picture below ?
A. Complicated cataract.
B. Diabetic cataract.
C. Post-radiation cataract.
D. Congenital cataract.
Ans:A. Complicated Cataract.
The instrument shown in the picture above represents Slit lamp.
- It consists of an illumination system and a binocular observation system, which when correctly aligned will result in a coincidental focus of the slit and microscope.
- The lamp facilitates an examination of the anterior segment and posterior segment of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea.
- Slit lamp examination of the lens of the eye in a case of complicated cataract shows bread crumbs like appearance and a characteristic rainbow display of colours which replaces the normal achromatic sheen (polychromatic lustre).
- Complicated cataract results from a disturbance of nutrition of the lens due to inflammatory or degenerative disease of other parts of the eye, such as iridocyclitis, ciliary body tumors, choroiditis, degenerative myopia, anterior segment ischemia, retinitis pigmentosa or retinal detachment.