Optical Glossary

//Optical Glossary

Optical Glossary

By | 2018-01-25T23:45:07+00:00 January 25th, 2018|Categories: Uncategorized|0 Comments


Computer Vision Reading Eye Glasses

Computer Vision Symptoms: headaches, tired eyes, burning eyes, watering eyes, itching eyes, dry eyes, double vision, blurred vision, eye fatigue, eye strain, bloodshot eyes, sore eyes, irritated eyes, and eye pain

Optical Glossary


– The power added to the distance prescription to provide for near vision

Anti-reflective coating

– a clear thin film of a certain thickness that when applied to a lens will absorb light that would have been reflected.

Anti-scratch coating

– a clear tough coating applied to plastic lenses to reduces scratches.


– a condition of the eye where the meridians of the eye are not the same causing a spot of light to appear as a streak


– the visual system of the eye has been broken down into 360 degrees like the numbers on a clock. These degrees are called axis and are used when prescribing astigmatism where the axis do not contain the same power.


– the thickest part of a prism and used to indicate the location of the prism when part of the prescription.

Base Curve

– the curve on the back side of a lens. In glasses it allows for clearance of the lashed when blinking, and in contact lenses it has an effect on the fit of the lens on the eye.

Bridge size

– the distance between eyeglass lenses to provide room for the nose.


– a clouding of the intraocular lens used to change focus.

Computer Vision Syndrome (CVS)

– A group of eye and vision problems experienced during computer use. Symptoms include eye fatigue, burning/irritated eyes, double and/or blurred vision, as well as, back, shoulder and neck pain.


– the process of turning the eyes inward to fixate on a nearby object.


– the difference between the greater and lesser power of the major meridians of the eye in astigmatism.


– a measure of the refractive power of a lens as relates to a meter of distance.

Eye size

– The horizontal measurement of a lens in millimeters.


– otherwise known as farsightedness where the focuses beyond infinity when at rest


– that part of the energy spectrum between 760 and 3000 nm. known as the heat ray and outside the visual spectrum.

Lens coatings

– surface coatings placed on a lens that filters the light going through it.

Mirror coating

– known as flash coating which is applied to the front surface of the lens to give a mirror effect.


– otherwise known as nearsightedness where the eye focuses inside of infinity when at rest.

Nose pad

– that portion of the eyeglass that rests on the nose.


– having to do with the eye and vision.


– short for oculus dextrous which is latin for right eye.


– short for oculus sinister which is latin for left eye.


– a type of lens which gets dark when exposed to light.


– light that vibrates in only one meridian such as reflected glare, instead of all meridians such as found with normal light.


– a condition where the eye loses it’s ability to change focus from distance to near.


– a lens where one edge is thicker than the opposit edge.

Pupillary distance

– the distance between the visual axis of the two eyes.


– the difference between the base curve of the front and back curve of the lens.

Temple length

– the distance from the hindge of the glasses to the top of the ear in inches.


– that part of the energy spectrum between 200 and 380 nm. and outside the visual spectrum.

Viewing distance

– the distance between a computer screen and the eye which is generally 20 to 28 inches.

Visible spectrum

– that part of the energy spectrum between 380 and 760 nm visible to humans.

End of Optical Glossary


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