How is pupil size is measured ( Include PERRLA)

Pupil size is measured using PERRLA.

P -pupils

E -equal

R -round

R -reactive (reactivity to light)

L -light

A -accommodation

R -shape of the eye. We have to check if it is round or abnormal(eg. keyhole shape).

R and L stands for reactivity to light.

PROCEDURE

With the aid of a pen torch, shine light into the subject’s eyes.

Check if the pupil constricts and dilates.

If it does, then the eye is reactive to light.

For accommodation, the subject is first asked to sit down.

Then, instruct her to look slightly up/far away.

Explain the test to the subject.

Next, hold a target a distance away from the subject.

Ask the subject to look at the target, and then look at something that is further away.

Do this a few times. If the pupil constricts and dilates, the eye is normal.

READINGS

1st subject, Kitru:(under normal situation)

Scotopic conditions: 5mm, Photopic conditions: 4mm

P: scotopic-5mm, photopic-4mm E: equal R: round R: 3++ L: 3++ A: eye accomodates

2nd subject, Venus: (under normal situation)

Scotopic conditions: 5mm, Photopic conditions: 3mm

P: scotopic-5mm, photopic-3mm E: equal R: round R: 3++ L: 3++ A: eye accomodates