4 Education Lenses

4 General Education Lenses
4 Educational Lenses
4 Lenses Of Education

That means more than 450 million of these cartridges are thrown away each year. When you Recycle4Education you raise money for education, create jobs and tax revenue, help keep our environment clean and safe for future generations, plus teach kids about the rewards of recycling. Viewing through the lens of natural sciences you can use logistics, and technology to view wellness. The historical lense may help you to understand the trends of wellness as well as the historical impact. Lastly, the humanities lenses allow you to understand the effects of wellness on cultures around the world.

What are the Four Lenses?

You will be exploring this term and the four items that make up this approach throughout your course. A 'lens' is a way to frame or think about the world around us. An easy way to visualize this would be to think about it in terms of colors. If you have ever used yellow lensed glasses for driving at night (helps reduce glare), it colors the way we actually see and experience the world. Imagine the lens of a telescope -- or a microscope -- helping an expert to view and study the world more closely. Each lens has its own 'color' that enhances that focus on particular things about the world. The four lenses being explored in this course are not as literal. They can be used as a learned perspective or way of interpreting how we think and experience things.

In the discipline of the Liberal Arts, there are several areas of study that create this term. At SNHU, we use the following four arts as lenses, or ways of thinking:

history
humanities
social sciences
natural sciences.

Watch the seven minute video below from the Online Writing Center, which does a great job explaining the lenses and prepares you to start thinking about different perspectives and ways of thinking.

1915
Part Number Title:
Occup. Safety and Health Standards for Shipyard Employment
1915 Subpart I
Subpart Title:
Personal Protective Equipment
Title:
GPO Source:

1915.153(a)

1915.153(a)(1)

The employer shall ensure that each affected employee uses appropriate eye or face protection where there are exposures to eye or face hazards caused by flying particles, molten metal, liquid chemicals, acid or caustic liquids, chemical gases or vapors, or potentially injurious light radiation.

1915.153(a)(2)

The employer shall ensure that each affected employee uses eye or face protection that provides side protection when there is a hazard from flying objects. Detachable side protectors (e.g., a clip-on or slide-on side shield) meeting the pertinent requirements of this section are acceptable.

1915.153(a)(3)

The employer shall ensure that each affected employee who wears prescription lenses while engaged in operations that involve eye hazards wears eye protection that incorporates the prescription in its design, unless the employee is protected by eye protection that can be worn over prescription lenses without disturbing the proper position of either the PPE or the prescription lenses.

1915.153(a)(4)

The employer shall ensure that each affected employee uses equipment with filter lenses that have a shade number that provides appropriate protection from injurious light radiation. Table I-1 is a listing of appropriate shade numbers for various operations. If filter lenses are used in goggles worn under a helmet which has a lens, the shade number of the lens in the helmet may be reduced so that the shade numbers of the two lenses will equal the value as shown in Table I-1, §1915.153.

Table I-1-Filter Lenses for Protection Against Radiant Energy

Operations	Electrode size 1/32 in.	Arc current	Minimum* protective shade
Shielded metal arc welding	Less than 3	Less than 60	7
3-5	60-160	8
5-8	160-250	10
More than 8	250-550	11
Gas metal arc welding and flux cored arc welding	Less than 60	7
60-160	10
160-250	10
250-500	10
Gas Tungsten arc welding	Less than 50	8
50-150	8
150-500	10
Air carbon	(Light)	Less than 500	10
Arc cutting	(Heavy)	500-1000	11
Plasma arc welding	Less than 20	6
20-100	8
100-400	10
400-800	11
Plasma arc cutting	(light)**	Less than 300	8
(medium)**	300-400	9
(heavy)**	400-800	10
Torch brazing	3
Torch soldering	2
Carbon Arc welding	14

** These values apply where the actual arc is clearly seen. Lighter filters may be used when the arc is hidden by the workpiece.

4 General Education Lenses

Filter Lenses for Protection Against Radiant Energy

Operations	Plate thickness-inches	Plate thickness-mm	Minimum* protective shade
Gas welding:
Light	Under 1/8	Under 3.2	4
Medium	1/8 to 1/2	3.2 to 12.7	5
Heavy	Over 1/2	Over 12.7	6
Oxygen cutting
Light	Under 1	Under 25	3
Medium	1 to 6	25 to 150	4
Heavy	Over 6	Over 150	5

* As a rule of thumb, start with a shade that is too dark to see the weld zone. Then go to a lighter shade which gives sufficient view of the weld zone without going below the minimum. In oxyfuel gas welding or cutting where the torch produces a high yellow light, it is desirable to use a filter lens that absorbs the yellow or sodium line in the visible light of the (spectrum) operation.

1915.153(b)(1)

Protective eye and face protection devices must comply with any of the following consensus standards:

1915.153(b)(1)(i)

ANSI/ISEA Z87.1-2010, Occupational and Educational Personal Eye and Face Protection Devices, incorporated by reference in § 1915.5;

1915.153(b)(1)(ii)

ANSI Z87.1-2003, Occupational and Educational Personal Eye and Face Protection Devices, incorporated by reference in § 1915.5; or

1915.153(b)(1)(iii)

4 Educational Lenses

ANSI Z87.1-1989 (R-1998), Practice for Occupational and Educational Eye and Face Protection, incorporated by reference in § 1915.5;

1915.153(b)(2) 4 Education Lenses

4 Lenses Of Education

Eye and face protection devices that the employer demonstrates are at least as effective as protective as eye and face protection devices that are constructed in accordance with one of the above consensus standards will be deemed to be in compliance with the requirements of this section.

[61 FR 26321, May 24, 1996; 74 FR 46358, Sept. 9, 2009; 81 FR 16091, March 25, 2016; 85 FR 8732-8733, February 18, 2020]