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Glossary

Navigate the language of eyecare with confidence. From clinical terms to practice management concepts, find clear definitions of the key language used across the optical industry.

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A

Afferent Pupillary Defect
What is an Afferent Pupillary Defect (APD)? An afferent pupillary defect (APD) is an abnormal pupil response caused by reduced afferent (sensory) input from…
Astigmatism
What is Astigmatism?  Astigmatism is a common refractive error that causes blurred or distorted vision. It occurs when the front…

B

Base Curve Contact Lenses
What is Base Curve in Contact Lenses? Base curve is one of the key measurements used when fitting contact lenses.…

D

Distance Visual Acuity (DVA)
What Is Distance Visual Acuity (DVA)? Distance visual acuity (DVA) measures how clearly a person can see objects at a…

E

Electronic Health Record (EHR)
What Is an Electronic Health Record (EHR)? An electronic health record (EHR) is a digital record of a patient’s health…
Electronic Medical Record (EMR)
What is an Electronic Medical Record (EMR)? A patient’s medical information has often traditionally been stored on paper — handwritten notes, physical…

G

General Ophthalmic Services (GOS)
What are General Ophthalmic Services (GOS)? General Ophthalmic Services (GOS) is the NHS framework under which sight tests and optical…
General Optical Council (GOC)
What is the General Optical Council (GOC)? The General Optical Council (GOC) is the statutory regulator for optical professions and…

I

Intraocular Pressure (IOP)
What Is Intraocular Pressure (IOP)? Intraocular pressure (IOP) is the pressure created by the fluid inside the eye. A healthy…

N

National Health Service (NHS)
What is the National Health Service (NHS)? The National Health Service (NHS) is the publicly funded healthcare system that provides…
Near Point of Convergence (NPC)
What is Near Point of Convergence (NPC)? Near Point of Convergence (NPC) is the closest distance from a person’s face…
Near Vision
What is Near Vision? Near vision is the ability to see and resolve fine detail at close range. It applies…
Negative Relative Accommodation (NRA)
What is Negative Relative Accommodation (NRA)? Negative Relative Accommodation (NRA) is a clinical test that quantifies the amount of accommodation…

O

Optic Zone Diameter in Contact Lenses
What is Optic Zone Diameter in Contact Lenses? Optic zone diameter (OZD) refers to the width of the central vision-correcting…

V

Visual Acuity
What is Visual Acuity? Visual acuity (VA) refers to the ability of the visual system to resolve spatial detail As…