Quizz 1 Flashcards
Utilités de la tomographie? (x5)
Determining the curvature (keratometry) of the cornea
Determing the axis of astigmatism of the anterior cornea
Screening for keratoconus
Measuring the corneal thickness (pachymetry)
Evaluating the posterior surface of the cornea
Utilités de la topographie? (x3)
Determining the curvature (keratometry) of the cornea
Determing the axis of astigmatism of the anterior cornea
Screening for keratoconus
Utilités de la topographie et de la tomographie?
Corneal topography AND tomography are useful for :
- Determining the curvature (keratometry) of the cornea
- Determing the axis of astigmatism of the anterior cornea
- Screening for keratoconus
In addition, corneal tomography is also useful for :
- Measuring the corneal thickness(pachymetry)
- Evaluating the posterior surface of the cornea
Quel est l’utilité du Wavefont Aberrometry?
Déterminer les lower order et les highly order aberrations
2 lower order aberrations vu en pratique
Defocus (myopie/hypermétropie)
Astigmatism
What is Kestenbaum’s rule?
P = (1/Va)-A
Où :
P = Power of reading add
Va = AV sur Snellen
A = Accomodative reserve
What comprises the 3 layers of the embryo? What ocular anatomy does each give rise to?
Neuroectoderm: Neurosensory retina, RPE, pigmented and non pigmented ciliary epithelium, pigmented iris epithelium, iris dilator and sphincter, optic nerve, axons, glia
Ectoderm: Skin, lens, vitreous, conjunctival and corneal epithelium, lacrimal system
Mesoderm: endothelial lining of ALL vessels globe/orbit, EOM fibres, superior temp sclera, vitreous
Neural Crest Cells: everything else
Three most common agents in follicular conjunctivitis?
Adenovirus
Herpes simplex
Chlamydia trachomitis
Where does the herpes virus remains latent?
Virus remains latent in SENSORY (trigeminal) ganglion and A.N.S. (système nerveux autonome) and possible the cornea
Atteinte épithéliale versus atteinte stromale dans l’infection à herpès simplex?
Épithélium = source de l’infection
Stroma = source de l’activation immune
Reccurence due to reactivation of latent virus residing in the trigeminal ganglia
Qu’est-ce The Herpetic Eye Disease Study (HEDS)?
Multicenter, prospective, double-masked placebo controlled clinical trial
To evaluate the efficacy of topical STEROIDS and oral ACYCLOVIR in treatment of HVS STROMAL keratitis
Conclusions STEROIDS
- Topical steroids were significantly better than placebo
- Reduced the persistence or progression of stroll inflammation
- Shortened the duration of HSV stroll keratitis
Conclusion ACYCLOVIR
- No statistically or clinically significant beneficial effect in treatment in patients already on topical steroids and viroptic
Vaccins disponibles pour l’HZV
Shingrix :
- À privilégier
- Vaccin inactivé
- Efficacité 97%
- 2 doses at least 2 months apart
Zostavax :
- Vivant atténué
- Efficacité 65%
- 1 dose
