Module 2: Lesson 9: Low Vision Flashcards
At what age does the visual fields typically mature?
7 months
What is the normal visual field range?
60 degrees nasally
100 degrees temporally
60 degrees up
75 degrees down
Define the term below:
Our ability to direct the eyes towards an object and create an image on the fovea like looking at the face of a loved one. This does not mature until the teen years.
Fixation
Define the term described below:
Our ability to move the eye smoothly while maintaining focus on an object (i.e. keeping focused on a ball during a kick ball game). Begins at 2-3 months and continues to improve throughout childhood.
Pursuits
Define the term described below:
Our ability to rapidly move the eye and focus from one object to another. Begins at 3 months and continues to develop over childhood.
Saccades
Define the term described below:
Our eyes ability to maintain focus at varying distances, is almost mature at 3 months of age.
Accomodation
Define the term described below:
The movement of both eyes in the opposite direction in order to create or maintain single binocular vision is usually developed by 6 months and 3D acuity reaches maturity at about preschool age.
Vergence
What 2 visual skills are important for a child to be able to move back and forth between near work, such as reading, to distance work such as looking at the blackboard.
Accommodation and vergence
What does the warren test assess?
Visual fixation
What part of the eye is the transparent outer layer of the eye. It is responsible for focusing light and has a refraction power of approximately 43 diopters. It covers the iris, pupil and anterior chamber.
Cornea
What part of the eye is the white portion the serves as protection and as an attachment point for the extraocular muscles?
Sclera
What part of the eye is a layer of tissue that covers the inside surface of the sclera.
Uvea
What part of the eye is a clear mucous membrane that lines the inner eyelids and front surface of the eye, except the cornea. It serves as protection and nourishes the cornea?
Conjunctiva
What part of the eye is responsible for receiving the light from an object?
Retina
What is cranial nerve 2 also known as?
Optic nerve
What is ocular albinism?
- A form of albinism present mostly in the eyes
- The retinal pigment epithelium lacks pigment while the hair and skin appear normal
What term is described below:
- A form of albinism present mostly in the eyes
- The retinal pigment epithelium lacks pigment while the hair and skin appear normal
Ocular albinism
What issues result from ocular albinism?
- Reduction in visual acuity
- High astigmatism and or nystagmus
- Strabismus
- Sensitivity to light (photophobia)
The following describes what condition?
- Reduction in visual acuity
- High astigmatism and or nystagmus
- Strabismus
- Sensitivity to light (photophobia)
Ocular albinism
Is there a treatment for albinism?
No
Symptom management only
What is retinitis pigmentosa?
- A group of ocular conditions in which the loss of photoreceptors leads to a decrease in vision, leading to blindness.
- Genetic
- Rods are the first phot receptors to be loss
- Complete vision loss can happen in early childhood, but most people progress slowly with legal blindness not occurring until adulthood.
What visual condition is described below:
- A group of ocular conditions in which the loss of photoreceptors leads to a decrease in vision, leading to blindness.
- Genetic
- Rods are the first phot receptors to be loss
- Complete vision loss can happen in early childhood, but most people progress slowly with legal blindness not occurring until adulthood.
Retinitis pigmentosa
Is there a treatment for retinitis pigmentosa?
Not currently
What are some things that can happen from corneal impairments?
- reduced visual acuity
- decreased contrast sensitivity
- discomfort and disability glare
- loss or relative reduction of visual field
- a combination of these
