The eye Flashcards
Aqueous humour
ANATOMY OF EYE IN PACK
Formed by epithelial cells in ciliary body. approx. 2mcl/min.
Secreted in to posterior chamber.
Aqueous humous fills space between the lens and cornea.
Circulated through pupil in to anterior chamber then drained via trabecular meshwork and schlemm’s canal [its a angle between the cornea and iris, the schlemm’s canal helps it return to blood stream] (80%) or uveoscleral pathway [through ciliary body] (20%)
Function is to transport nutrients to the eyes and waste products from the eyes. Helps keep eye shape and retina position.
Balance of production and drainage of the aqueous humour controls IOP.
Normal IOP - 10-21mmHg. Max levels at 8am-11am, Minimum levels at midnight-2am. = Diurnal variation.
Steps for Instilling Eye Drops, Gels and Ointments
Most eye meds used in these forms.
Most act locally at low CONC.
Advised to wash hands b4 applying eye meds or touching eye area.
Wash hands after too to prevent ingestion of med and spread of infection.
EYE DROPS
1. Head is tilted backward.
2. With the index finger placed on the soft spot just below the lower lid, gently pulling down to form a pocket.
3. A drop is instilled into the pocket.
4. Patient lets go of the lower lid, shutting the eyes but not too tight or squint, this prevents loss of portion of the dose.
5. Gently press on the inside corner of the closed eyes with the index finger and thumb for 2-3mins. Helps reduce the systemic absorption.
Eye gels and ointments
1. Gently lay a thin strip of the medication along the conjunctival sac from the inner canthus to the outer canthus.
2. Avoid touching the eye with the ointment tube itself.
3. Release the eye lid and roll the eye behind closed lids to distribute the medications
