7-8 Iris (Dr. H)

Question 1

(TP) Which layer of the Iris is the dilator muscle?

Answer 1

Anterior Epithelium

Question 2

(TP) what’s the diameter of the iris?

A) 3mm

B) 8mm

C) 12mm

D) 16mm

Answer 2

C) 12mm

Question 3

(TP) Where is the Major Circle of blood supply to the Iris?

Answer 3

Ciliary Body!!

Question 4

(TP) You fire a diode laser shot at the iris and see black charring on the surface. What layer was affected?

A) anterior border layer

B) stroma and sphincter muscle

C) anterior epithelium and dilator muscle

Answer 4

A) Anterior Border Layer

Question 5

(TP) You fire a YAG laser shot at the iris and see pigment coming out of the pupil. What layer of the iris did this?

A) anterior border layer

B) stroma and sphincter muscle

C) anterior epithelium and dilator muscle

D) posterior epithelium

Answer 5

D) posterior epithelium

Question 6

(TP) You fire an argon laser shot at the iris and see contraction at the spot, what layer affected?

A) anterior border layer

B) stroma and sphincter muscle

C) anterior Epithelium and dilator muscle

D) posterior epithelium

Answer 6

B) stroma and sphincter muscle

Because the STROMA was shot

Question 7

(TP) you fire and infrared diode laser at the iris and notice radial movement from the pupil to the limbus. What layer is this?

A) anterior border layer

B) stroma and sphincter muscle

C) anterior Epithelium and dilator muscle

D) posterior epithelium

Answer 7

C) anterior Epithelium and dilator muscle

Runs from iris root to midway up the sphincter, so we hit dilator muscle

Question 8

(TP) The color of the iris is caused by…(2 answers)

A) number of melanocytes

B) color of sky

C) color of melanin within melanin within melanocytes

D) the number and type of melanin granules within the melanocytes

Answer 8

C and D would work here