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OV2021 dispensing > Dispensing in sport > Flashcards

Dispensing in sport Flashcards

1
Q

What does sports eye wear aim to do ?

A
  • improve vision by -enhancing contrast and reducing glare

- provide protection via impact resistance and UV protection.

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2
Q

What are the main hazard for racket sports glasses?

A

-Squash ball travels at high velocity- 140mph but up to 176mph
-Squash ball is approx. 40mm diameter
-Injuries due to racquet sports represent 47.5% of ocular trauma
that required hospital admission
- therefore need to make sure frames and lenses need to provide protection

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3
Q

What protects the orbital socket from damage ?

A
  • bone structure- facial bones in nose, cheek and forehead- if hit by a football suppose.
  • however a squash ball is small enough to fit within the socket
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4
Q

What injuries do racquet sports cause?

A
  • involve blunt trauma
  • Blunt trauma
  • Blow out fracture
  • Ruptured globe- push eyeball intro circuit
  • Hyphema
  • Retinal haemorrage
  • Retinal detatchment -Commotio retinae
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5
Q

What are the 2 British standard for racquet sports ?

A
  • Must conform to EN167 and EN166 (Personal eye protection). Squash- BS7930:1
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6
Q

What are the rules for racquet sports?

A
  • Now mandatory for all doubles squash players and juniors to wear protective eyewear.
  • Cant be worn over specs.
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7
Q

How racquet sports glasses can be made?

A
  • Can be glazed with Rx

- Glazed ‘loose’ to allow impact to be absorbed by glasses

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8
Q

What to consider when giving racquet sports glasses?

A

wide field of view

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9
Q

What do the racquet sport frames designed as ?

A

being padded to help absorb any shock and help prevent bruising.
-Thick silicone molded cushion pads to protect the nose on
impact.
-Elasticated headbands instead of standard sides.
-Can be ventilated to prevent streaming up
-Should be adjustable for good fit
-Commonly nylon

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10
Q

What are the lenses of racquet sports glasses made of ?

A
  • Polycarbonate for impact resistance
  • Coated for anti-fog
  • Can be high base curve if curved- can change base curve of lens so they can fit in a certain frame
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11
Q

What are some things to consider for snooker glasses?

A
  • Head position

- Effect on vision

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12
Q

What should the frames of snooker glasses be like ?

A

-Must have joint angles to allow for retroscopic and Pantoscopic
tilt
-Dispensers rule for retroscopic tilt Raise the heights by half of
the retroscopic angle.

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13
Q

What should the lenses of snooker glasses be like ?

A

-Require 50mm depth- great depth- so need be of large blanc size
-MAR
-The visual axes must still be approximately
the lens.

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14
Q

What needs to be considered for shooting glasses ?

A
  • Eye dominance- whether they prefer one eye - occluded or not- ask what type of shooting they err doing.
  • Contrast
  • Lenses
  • Tints- colour? how dark?
  • Lenses can be tilted and centered according to the shooters position.
  • The non shooting eye can be occluded.
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15
Q

What tints are good for shooting glasses ?

A

bronze tint- often used in clay pigeon shooting

  • yellow tint- good in shooting on black and white target- good contrast
  • red and pink tint- good for black and green targets- reduce effects of green background
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16
Q

What can. the frames be like on shooting glasses ?

A

-Can be hung from a mount -Can include a pinhole- reduce aberrations and increase how well px are seeing.

17
Q

What does a darker tint mean ?

A

-less light is reaching the eye-
the pupil will expand more to let light in- this is less preferable for shooting because we want the pupil to be small as possible acting as pinhole itself.
1§-the px may prefer the lighter tent hence.

18
Q

What are the British requirements for skiing goggles?

A
  • UV requirements BS EN 12312 - protect against UV-
  • polarised glasses not good for this-as may not be able to see changes in contour
  • should have high Impact resistance
  • Tints, which colour and why? -Rx!
  • Polarizing
19
Q

Why do we require UV protection for skiing goggles (BS)?

A

-the snow itself is highly reflective and can cause photo keratitis and snow blindness - the British standards for skiing goggles- in extremely high luminance conditions such as snowfall or desert , which under full sunlight the use of category 4 filters may be recomended- LTF of 15% (darker tints)

20
Q

What are the frames of skiing goggles like ?

A
  • can be glazed- often have removable inset for glazing

- adjustable headband to help the glasses stay on when they are skiing

21
Q

What are the tints usually used on lenses on the skiing goggles?

A

grey tint- often used as It keeps very true to colours as it reduces visible light through all spectrums equally
-yellow or rose filters- filter out blue lights- preferred by px

22
Q

What are the lenses like on skiing goggles?

A
  • mirror coatings- provide extra protection from UV
  • transitions- some px like as they work well in cold environment
  • anti-fog
23
Q

How can swimming goggles be glazed?

A
  • by providing clip in lenses for the frame surrounding it
  • generally plano concave or convex- so that the curvature is all place on the back surface and isn’t influenced by the surrounding media
  • the lens maker equation -assumes in air- but r.i of water is different to air- by glazing the curves on the back surface that isn’t touching water-it is easier to glaze these lenses
24
Q

What do the clip in lenses come in ?

A

come in standard spherical prescriptions

  • may not work with px with high cyls
  • better to use a near match to px prescription than their exact prescription
  • spherical power -2 - 6 are available
25
Q

What are some things to consider as a diving mask ?

A
  • Pressure changes - when changing in water
  • Watertight fit
  • Frame
  • Can be full or half mask
  • Silicone seal- used in watertight seal
  • good seal- could be occluded or clear- which provide some peripheral Vision
  • dark seal- can reduce internal reflections
26
Q

What types of lenses to give to a diving mask ?

A
  • Tempered glass- as they dont react badly under pressure changes under water
  • Can have rx insert- glazed with rx
27
Q

What are some things to consider with cycling or running ?

A

Impact resistance

  • Smaller debris (dust, insects) -UV protection
  • Glare protection
  • FOV- lenses with a higher base curve- increases FOV - even though it isn’t perfect in periphery they will still know if anything come around .
  • Contrast enhancement (yellow tint can be popular)
28
Q

What are the frames like in cycling or running?

A
  • Require excellent fit
  • Lightweight
  • Detachable sides
  • interchangeable lenses
29
Q

What are the lenses like in cycling or running?

A

-Polycarbonate for impact resistance
-Wrapped- so consider base curve to increase FOV and off axis
performance
-Contrast enhancing tints

OV2021 dispensing (7 decks)

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