Ophthalmic Products and Materials Questions and Answers Flashcards
7 cards from real ABO NOCE Basic Opticianry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ophthalmic Products and Materials Questions and Answers flashcards as text
Which frame material requires soldering for repairs and adjustments?
Answer: Metal frames (monel, stainless)
Metal frame repairs typically require soldering to reattach broken parts or reinforce stress points, unlike plastic frames which are heat-adjusted or replaced.
What is the optical significance of a lens with a higher Abbe number?
Answer: Less chromatic aberration and better color fidelity
A higher Abbe value (also called V-value or constringence) means the material disperses light into its color components less, resulting in less chromatic aberration.
A patient complains that their new lenses cause rainbows around lights at night. This is most likely caused by:
Answer: Lens material with low Abbe value causing chromatic aberration
Chromatic aberration from low Abbe value lens materials causes light to split into rainbow-like color fringing, especially noticeable around point light sources at night.
Which lens design feature helps a wearer using digital devices by providing an extended intermediate zone?
Answer: Office/computer progressive lens
Office or computer progressive lenses (also called near variable focus lenses) are designed specifically to optimize intermediate and near vision distances for digital device users.
What is the recommended minimum center thickness for a polycarbonate lens to meet FDA drop ball impact resistance standards?
Answer: 1.0 mm
Polycarbonate lenses must have a minimum center thickness of 1.0 mm to meet FDA impact resistance requirements, compared to 2.0 mm for glass and CR-39.
An oleophobic coating on an ophthalmic lens is designed to:
Answer: Repel oils and fingerprints from the lens surface
Oleophobic coatings repel oils from skin and fingerprints, making the lens surface easier to wipe clean and reducing smudging.
Which of the following best describes the difference between photochromic and polarized lenses?
Answer: Photochromic lenses darken in UV light; polarized lenses block reflected glare regardless of tint level
Photochromic lenses change tint based on UV exposure while polarized lenses filter reflected horizontal glare through a fixed polarizing filter regardless of their current tint level.