RET

Question 1

Pupil distance OC Distance/near

Answer 1

• Ambient lighting
	- Pen torch under my left eye, shown on pX
	- 40cm from pX
	- Px focuses on open eye
	- Measure distance PD via both eyes
	- Reading PD via focus on nose
Record as 65/63

Question 2

Retinoscopy (one eye) instructions

Answer 2

• Clean phoropter + hands
  
  • Set phoropter with Px PDs, and place in position
    • Red/Green on screen (with big E)
    Dim lights
  • Set phoropter with R setting (+1.50D)
    Set ret with sheath down (diverging lens)
  • Be 67cm from phoropter and shine ret into chosen eye
    Sweep horizontally, observe motion of reflex light

Question 3

Retinoscopy procedure following reflex

Answer 3

1. Angled reflex line
   Change angles to find the motion with the most SLOW WITH MOTION
   Change angle of ret, to match angle of reflex
   
   2. With motion
      Sweep and increase power of phoropter until reverse and take one step back
      - Change to other angle and adjust cyl
   3. Against motion
      Sweep and increase -cyl power until reverse and take one step back

Question 4

VA (from ret in one eye)

Answer 4

• Set Snellen chart near where unaided VA was observed
• Brighten lights
• Occlude one eye
“please read down the chart”
- Terminate at <3 letters read
Record smallest line read plus or take missed/added letters to the nearest 2

Question 5

Retinoscopy script

Answer 5

“Now we will be doing a retinoscopy, all that means is ill shine a light into your eye to examine your prescription.
Can you see the red and green screen? im changing the lenses, I just need you to focus on the green side of the screen, let me know if i get in the way”