spectacle frame
Download
Skip this Video
Download Presentation
Spectacle frame

Loading in 2 Seconds...

play fullscreen
1 / 34

Spectacle frame - PowerPoint PPT Presentation


  • 763 Views
  • Uploaded on

Spectacle frame. Faculty Aravind School of Optometry. Spectacle -Definition. An optical appliance. Combination of lens and frame front with extended sides. Holds the lenses in the proper position before the eyes. Frame front. Front : portion that contains lens.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Spectacle frame' - cade-ashley


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
spectacle frame
Spectacle frame

Faculty

Aravind School of Optometry

spectacle definition
Spectacle -Definition

An optical appliance.

  • Combination of lens and frame front with extended sides.
  • Holds the lenses in the proper position before the eyes.
frame front
Frame front
  • Front: portion that contains lens.
  • Bridge: middle area of the two lenses.
  • Eye wire: rim on around the lenses
  • End piece: outer areas of the frame front.
  • Shield: the metal piece to hold the hinge in place
frame side temple
Frame side / Temple

Temple: attaches to the frame front and hooks over the ears.

Earpiece/ Curl: part of temple lies past the temple bend

Includes Shaft/Shank, Bend, Shield, Dowel Hole, Butt portion.

temple style
Temple style
  • Five temple design used.
bridge
Bridge

Plastic Metal

types
Types
  • Plastic frames.
  • Metal frames.
  • Rimless frame.
plastic materials
Plastic Materials
  • Cellulose nitrate
  • Cellulose acetate
  • Cellulose propionate
  • Carbon fiber graphite
  • Polycarbonate
  • Polyamide
  • Nylon
  • Optyl
quality plastic materials
Quality plastic materials
  • Nylon

- first introduced in the late 1940s

- unbreakable, hypoallergenic material.

- used for injection-molded sun glasses and men’s frame styles.

- because of brittleness and other problems, manufacturers switched to blended nylon .

- blended nylon frames are both strong and lightweight.

Optyl

- a hypoallergenic and light weight material.

- maintains its original shape ,long time.

plastic drawbacks
Plastic - Drawbacks
  • Easy to break than metal frames.
  • Burn but are not easily ignited.
  • Aging and exposure to sunlight slightly decrease their strength but do not affect color.
metal materials
Monel

Nickel

Nickel –Silver

Phosphorous bronze

Stainless steel

Titanium

Beryllium

Ticral

Flexon

Aluminum

Cobalt

Silver

Gold

Metal - Materials
metal frames
Metal frames
  • Monel(nickel and copper):

- strong stable material for making nose pad arms, bridges and end pieces.

- the most widely used malleable and corrosion-resistant material.

  • Nickel:strong and generally in making nose pad arms & an allergic to few persons.
  • Nickel-silver : strong rigid material suitable for hinges, end pieces, bridges and decorative rims &becomes brittle.
  • Phosphor-bronze : an alloy comprised mostly of copper.

& adjustment is difficult due to the “springy” characteristics of the material.

  • Steel : very strong and thin.

- alloy metal comprised of manganese, nickel, iron and chromium.

costly materials
Costly materials

Titanium

  • a silver-gray metal.
  • durable, strong and corrosion-resistant.
  • can be produced in a variety of colors for a clean, modern look with a hint of color.
  • No allergic to wearers /suitable to all.

Aluminum

- popular & lighter than titanium and highly corrosion-resistant.

- used primarily by high-end eyewear designers because of the unique look it creates.

- the most widely used, nonferrous material.

- Pure aluminum is actually soft and weak, but commercial aluminum with small amounts of silicon and iron is hard and strong.

- rigid material that is difficult to adjust.

costly materials1
Costly materials

Beryllium

- lower-cost alternative to titanium eyewear

- resists corrosion and tarnish.

- an excellent choice for wearers who have high skin acidity or spend a good amount of time in or around salt water.

- lightweight, very strong, very flexible (making it easy to adjust glasses)

- available in a wide range of colors used in making temples with other metals.

Cobalt : provides good polish and finish in thin frames and expensive.

frame designs
Frame Designs
  • Full frame
  • Combination frame
  • Semi-rimless
  • Full rimless (or) Drill mount
  • Half eye
suitable frame for different faces
Oval shape face - Any frame designs

Round face - Angular frames

Square face - Round / Oval shape

Long face & Triangle - Deep vertical frame

Inverted triangle designs - Oval / Round diamond face

Suitable frame for different faces
introduction
Introduction
  • Frame and lens measurements are marked in boxing system.
  • Optical technicians depends the measurements to fit lens accurately.
  • Essential for accurate dispensing to provide the comfort vision with spectacle.
definition
Definition

A system based on rectangle formed by the horizontal & vertical lines tangential to the extremes of each lens.

bridge specifications
Bridge: Specifications
  • DBL : is a bridge width.
  • Measures between the nasal corner of lens eye wires.
  • Useful to choose the lens blank

( Frame PD/ Geo.Center) is necessary to determine the blank size.)

lens size measurements
Horizontal measurements

Measures between the horizontal inside of the eye wires.

Add 1mm for the groove of the lens.

Vertical measurements

Measures between the vertical inside of the eye wires

Add 1mm for groove inside of eye wire.

Important for

OC placement

fixing the segment height

Lens size measurements
f ace measurements
Face measurements
  • An Optician’s ruler is used to take measurements.
  • To select the appropriate size frame.

Inaccurate sizes greatly affect the overall cosmetic appearance and comfort ness.

  • To hold the spectacle lens in place.
face measurements
Face Measurements
  • Monocular PD measurements.
  • Bridge size.
  • Intra temporal distance.
  • Length to bend.
  • Length of drop / angle of ear piece.
  • Pantoscopic tilt.
  • Vertex distance.
  • Segment height.
segment height
Segment Height
  • Determines the placement of segment.
  • Measures from deepest portion of the eye wire.
  • SH varies depends on
    • the old spectacle
    • the visual needs in occupational spectacle.
how to locate a segment height
How to locate a segment height?
  • First measure the vertical measurements (VM).

(Assume 50mm).

  • Measure Geometrical center = VM / 2.

i.e.,50 / 2 = 25 mm

  • Mark 3 mm below Geo.Center for segment height,

i.e.,25 – 3 = 22 mm,.

  • Final SH would be around 22mm.
segment inset
Segment Inset
  • Decide by calculating the total amount of Decentration

=

(lens size + DBL) – Patient PD

effective diameter specifications
Effective diameter: Specifications
  • Measure from one frame corner to other .
  • Important for selecting the lens/blank size.
  • Min.blank size is determined by adding the ED value with the total decentration + 2mm for edging purpose.
  • Add 1 mm for groove inside the frame.
slide29
For the very best fit, think width. That’s right. Top eye experts use width to ensure perfect fit. How? They measure the distance from the hairline of your left temple to the hairline of your right temple and from the left to the right pupil. These measurements are useful for three purposes: - frame selection - lens adaptation - frame and lens final adjustment for optimum comfort Just like when you choose a hat, helmet or shoes, eyewear fit based on your personal measurements is essential for comfort and performance.
slide30
Eyewear must be customized. Now, take a look in the mirror to determine the shape of your face. Let eyecare people advise you. There are approximately 5 main face shapes as shown above: oval, round, rectangular, square, and triangular. Once you know your face shape, it is easier to figure out the effect various eyeglass frames will have on your overall look. Try several styles.
slide31
You may be surprised what style suits you best! Oval: if you have an oval face, you have the widest range of eyeglass frames to choose from. Large, small, conservative or daring, frames of all kinds can suit you — as long as they are well-fitted! Round: if your face is round, eyeglasses will either accentuate or downplay its shape. Oval or round eyeglasses will tend to make your face look rounder and softer.
slide32
Eyeglasses with crisp, straight lines will break up its roundness and give it a more structured, geometric look. Rectangular: smaller frames with a horizontal line tend to emphasize the length of a rectangular face. Bigger, longer frames are more appropriate if you want to make your face appear shorter. Square: if you have a square face, think circles or straight lines. Oval or round glasses will contrast with your face to de-emphasize its squareness. Geometric shapes with straight lines, like squarish, rectangular and triangular glasses will play up your square features. Triangular: if your face is triangular, eyeglasses with pointed angles will bring out the shape of your face more. If it’s a straighter, longer look you are after, you will want to try on some rectangular eyeglasses.
ad