**Question:** Corneal tattooing may be done with

A. Wood's lamp
B. Needle and ink
C. Laser
D. Tattoo machine

**Correct Answer:** D. Tattoo machine

**Core Concept:** Corneal tattooing is a procedure used to improve visual acuity in patients with corneal opacities or scarring. It involves depositing pigment into the corneal stroma using various techniques.

**Why the Correct Answer is Right:** A tattoo machine is a device used for applying tattoo pigments into the skin. In the context of corneal tattooing, it functions to deposit the pigments into the corneal stroma. This is different from the other options:

A. Wood's lamp: A special type of illumination used for examining the eye, rather than depositing pigments into the cornea.
B. Needle and ink: Refers to traditional tattooing methods, which are not suitable for depositing pigments into the corneal stroma.
C. Laser: Lasers are used for ablative or non-ablative treatments of corneal pathology, not for depositing pigments.

**Why Each Wrong Option is Incorrect:**

A. Wood's lamp: As mentioned earlier, Wood's lamp is used for examining the eye rather than depositing pigments into the cornea.
B. Needle and ink: Traditional tattooing methods involve using a needle and ink to deposit pigments into the skin, not the cornea.
C. Laser: Lasers are used for ablative or non-ablative treatments of corneal pathology, not for depositing pigments into the cornea.

**Core Concept (repeated for clarity):** Corneal tattooing involves depositing pigments into the corneal stroma to improve visual acuity in patients with corneal opacities or scarring.

**Why the Correct Answer is Right:** A tattoo machine is specifically designed to deposit pigments into the skin, making it suitable for depositing pigments into the cornea during corneal tattooing.

**Why Each Wrong Option is Incorrect:**

A. Wood's lamp: Wood's lamp is not suitable for depositing pigments into the cornea.
B. Needle and ink: Traditional tattooing methods involve using a needle and ink for depositing pigments into the skin, not the cornea.
C. Laser: Lasers are used for ablative or non-ablative treatments of corneal pathology, not for depositing pigments into the cornea.

**Clinical Pearls:** Corneal tattooing is an important technique in ophthalmology for improving visual acuity in patients with corneal opacities or scarring. The choice of method (tattoo machine) is crucial for depositing pigments into the cornea effectively.

**Core Concept:** Corneal tattooing is a technique used in ophthalmology to improve visual acuity in patients with corneal opacities or scar