14. Name two types of colour vision tests 2 marks The two types of colour tests are Ishihara colour test plates and Farnsworth Lantern dichotomous test and Farnsworth-Munsell 100 hue colour test. 15. What are the referral protocols and procedures for Optical Dispensers? 3 marks Optical dispensers do not refer in the medical sense‚ however there will be times where be times when a n optical dispenser will see an individual with an eye injury or eye condition. The dispenser is not permitted
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and hyaline cartilage. Issue #3: Eye problems 1. The term for someone who has problems seeing close objects but can see objects far away is “hyperopia” or farsightedness. 2. Contrarily‚ “myopia” or nearsightedness is the condition of being able to see objects up close but not ones far away. 3. David appears to have hyperopia‚ since he needs to hold a paper at arm’s length to be able to read. Issue #4: Muscle Physiology 1. The cause of the muscle cramping is hyponatremia
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for ‘eye’: A) Ot/o B) Opt/o C) Ophthalm/o D) A and C E) B and C 2. Core/o: A) Cornea B) Pupil C) Lens D) Sclera 3. Farsightedness is also termed: A) Myopia B) Hyperopia C) Haplopia D) Isopia 4. ______osis = abnormal contraction/lessening of the pupils: A) SclerB) MiC) ScotD) Arcu5. Condition where the eye adjusts for vision in dark light: A) Myopia B) Photopia C) Scotopia D) Ametropia 6. Breaking down or dissolution of the lens of the eye: A) Corneolysis B) Phacolysis C) Keratolysis D) Retinolysis
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Question 1 - Definitions Visual Acuity Visual acuity is a test used to determine the smallest letters a person can read on a standardized chart (Snellen chart) or a card held 14 – 20 feet away. This test may be done in a health care provider’s office‚ a school‚ a workplace‚ or elsewhere. Visual acuity is expressed as a fraction. • The top number refers to the distance you stand from the chart. This is usually 20 feet. • The bottom number indicates the distance at which a person with normal
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between the aqueous and vitreous humor. 14. Where are cones located and what purpose do they serve for vision? 15. Where are rods located and what purpose do they serve for vision? 16. List the “basics” of the following vision abnormalities: myopia‚ hyperopia‚ astigmatism‚ cataracts‚ glaucoma‚ conjunctivitis‚ color-blindness‚ night-blindness‚ macular degeneration. 17. How are each of the above corrected if they can be? 18. What are the functions of the maculae? 19. What portion of the ear contains
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Human Physiology Lab Special Senses Cutaneous Senses and Vision September 24/26‚ 2012 Our bodies are capable of sensing a wide spectrum of stimuli. We are consciously aware of some of the information our bodies perceive‚ but much of the information that is sensed is beyond our consciousness. Receptors responsible for perception of stimuli are found in many places: skin‚ eyes‚ ears‚ mouth‚ blood vessels‚ lungs‚ brain—frankly‚ every cell in the body has sensory receptors. These receptors are
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COMMON AILMENTS/DEFECTS OF SCHOOL CHILDREN DENTAL CARIES * Dental caries is an infectious‚ communicable disease‚ which causes destruction of teeth by acid-forming bacteria found in dental plaque. * Early childhood caries (ECC) is a “virulent” form of dental caries that can destroy the teeth of preschool children and toddlers. Early childhood caries can also be defined as the occurrence of any sign of dental caries on any tooth surface during the first 3 years of a child’s life. Economically
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operation. LASIK stands for Laser- Assisted In Situ Keratomileusis. This is an operation in which the shape of the cornea is permanently changed by a laser to correct vision problems. Some of the disorders that can be corrected are: astigmatism‚ hyperopia‚ and myopia. An astigmatism is "a distortion of an image on the retina caused by irregularities in the cornea
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The senses transmit sensory information’s‚ in the form of electrochemical impulses‚ to the brain. Different forms of energy stimulate the sensory receptors – the nerve endings and cells that detect sensory information. The sensory receptors then initiate neural impulses. Sensation occurs when the neural impulses arrive at the cerebral cortex. Neural impulses that begin in the optic nerve are sent to the visual areas of the cerebral cortex‚ and we see objects. Each person’s unique perception results
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MIRROR -The simplest and the most common optical instrument. -Uses the Law of Reflection to redirect light it receives. -It reflects most of the light in one direction. -Good reflecting mirrors can have 85% reflectance. Types of Mirror 1. Plane Mirror A mirror with a flat surface. Image formed: Laterally inverted Upright and always the same size as the object they reflect. Virtual image (images appear to behind the mirror) at the same distance as the object in front of the mirror. Examples:
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