Evaluation parameter of opthalmic products
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Drug product quality tests and drug product performance tests Procedures and acceptance criteria for testing ophthalmic preparations are divided into two categories: those that assess general quality attributes, for example, identification, potency, purity, (and impurities), sterility and particulate matter.
Q factor is a parameter that describes the resonance behavior of an underdamped harmonic oscillator (resonator). Sinusoidally driven resonators having higher Q factors resonate with greater amplitudes (at the resonant frequency) but have a smaller range of frequencies around that frequency for which they resonate; the range of frequencies for which the oscillator resonates is called the bandwidth. Thus, a high-Q tuned circuit in a radio receiver would be more difficult to tune, but would have more selectivity; it would do a better job of filtering out signals from other stations that lie nearby on the spectrum. High-Q oscillators oscillate with a smaller range of frequencies and are more stable. (See oscillator phase noise.)