Card Set Information
DPA TPA optometry drugs
2 names of drugs?
registered trade names
Solution methods of administration?
multidose- 4-6 weeks, preservatives, cost effective, allergies, contamination
minims- single dose, no preservatives, no contamination, no allergies
Impregnated paper strip method of administration?
activated with soln
eliminates cross contam
Ointment method of administration
oily base-sticks to cornea
Adverse reactions to drugs?
Px factors when administering drugs?
age- dose differences
iris colour- add more in pigmented
mydriasis is controlled by which part of the ANS
Miosis is controlled by which part of the ANS?
What do topical anaesthetics do?
applied to eye to produce reversilbe blockage of the corneal and conjunctival sensory nerves
increases corneal permeability- enhances transport of subsequently applied drugs through cornea- loosens tight junctions
loss of corneal blink reflex- corneal trauma
When can you NOT use topical anesthetics on the eye?
Where should the topical anesthetic be applied on the eye?
lower palpebral sac
NOT cornea- may enhance toxic reaction
What are the 2 classes of drugs that cause mydriais?
What do parasympolytic drugs do to the eye"?
antagonisitic action on muscarinic receptors on
sphincter papillae and ciliary muscle
causes both mydriasis and cyclo
What do sympathomimetic drugs do to the eye?
stimulates dilator papillae muscle
causes mydriasis without cyclo
Contraindications of mydriatic drugs?
What are some adverse reactions of mydriatics?
systemic side effects
angle closure glaucoma
What percentage dose of mydriacyl is used in blue/brown eyes and max dilation?
What are the uses of miotics?
closed angle glaucoma attack
may cause transient myopia-ciliary spasm
How does fluoroscein work?
stains tight junctions
poor lipid solubility- does not penetrate intact cell membranes
How does a cobalt blue filtered light work to show staining?
fluoroscein dye absorbs energy frmo visible light at a lower wavelength and re-emits it at a higher wavelength
What are the uses of fluoroscein strips?
Assessing the integrity of the cornea/anterior eye
Diagnosis of dry-eye
Ritting RGP contact lenses
How does rose bengal staining work?
stains degenerate cells and their nuclei
will hence locate damages and devitalised cells in the cornea and conjunctiva.
What are the uses of rose bengal staining?
used for the diagnosis of dry eye
will cuase a little stinging when applied