Mod 2 Flashcards
What is visual activity?
Acuteness or sharpness of vision
What causes astigmatism to have distorted and blurred vision?
The cornea is curved into oval shape
What does a ophthalmologist do?
Treats diseases and disorders of the eye
What does a optometrist do?
Treats refractive errors of the eye
What does an optician do?
Fills prescriptions for eye glasses and contacts
What condition can be detected by measuring distance visual acuity?
Myopia
What type of patient would use the Snellen Big E chart?
Preschool children
What does the top number represent on the Sellen Big E chart?
Distance in feet
What does the bottom number represent on the Sellen eye chart?
Distance in which a person with normal vision can see
What two conditions can be determined by measuring near visual activity
Hyperopia and presbyopia
What is congenital color vision defect?
Color vision deficiency that is inherited
What is acquired color visual defect?
Color deficiency that is acquired
What is primary colored dots arranged to form a numeral against a background of similar dots for contrasting colors?
Polychromatic plate
What is the purpose of eye irrigation?
- to cleanse the eye of foreign particles
- ocular discharge
- relieve of inflammation
What is a reason to preform eye instillation?
- treat eye infections
* soothe an irritated eye
What is the range of frequency for normal speech?
300 to 4000 Hz (Hertz) at a normal sound intensity
What are some conditions that can cause conductive hearing loss?
- obstruction in external ear
- foreign bodies
- swelling
- benign growths
- impacted cerumen
What conditions cause sensorineural hearing loss?
- hereditary factors
- degenerative changes
- intense noise exposure
- infectious diseases
What info is obtained through audiometry?
How extensive a hearing loss is and what frequencies are involved
Why would you preform ear irrigation?
- cleanse external ear
* relieve inflammation
Why would you preform ear instillation?
- relieve pain
- combat infection
- cleanse auditory canal
How to remove impacted cerumen?
Must be softened for 10-15 mins
What is refraction ?
Bending of light rays so they can be focused on the retina
Nearsightedness
Myopia
