{Practical 4...Pupils!}
Thursday, February 11, 2010
Above is a video instruction of how to measure a person's pupil size by using PERRLA.
PERRLA is also used to check if the pupils are functioning properly and that the subject does not have any ocular diseases that affects the pupils.
Results for subject (Ke Yi):
PUPILS:
- To make sure that the patient has pupils to begin with
- Pupils are present in both eyes
EQUAL:
- To check if pupils are equal in size in both scoptopic and photopic conditions
- Scoptopic (dim) conditions: 6mm for both right and left eyes
- Photopic (bright) conditions: left eye is 4mm and right eye is 3mm
ROUND:
- To check if the pupils are of normal shape, which is round.
- Both pupils are round
REACTIVE TO LIGHT:
- This is to check the pupils reaction to light
- Using a pen torch, shine at the left eye to check constriction of pupils for direct pupillary reflex
- Shine the pen torch on the left eye again but observe the right eye for constriction for consensual pupillary reflex
- Both pupils are reactive to the light introduced
ACCOMMODATION:
- Check if accommodation for both pupils are working when subject focuses on a distant object and a near object
- Focusing at a far object, pupil would dilate
- Focusing at a near object or reading, pupil would constrict
- Subject’s pupils are accommodating as per normal
Ocular Physiology Practical 4, 7:09 AM
Pupil is a circular opening
located in the centre of the
iris of the eye that controls
the amount of light
entering the eye.
