Table 1.

Prevalence, incidence and progression of glaucoma.

Probability	Value	Source
Prevalence of glaucoma	1–5%	Assumption based on prevalence rates for general population and high prevalence subgroups5,14
Progression to moderate glaucomaa	0.129	Progression data from GSM 20075,14
Progression to severe glaucoma	0.048	Progression data from GSM 20075,14
Progression to visual impaired	0.042	Progression data from GSM 20075,14
Annual probability of having an eye test in current practice (not screening):
General population (adults over 40 years old)	0.1728	Based on survey of the UK public21
General population (adults over 40 years old)	0.0741	Based on BHPS data and alternative assumptions22
Individuals with diabetes	0.1693	Based on BHPS data22
Individuals with eye problems	0.1192	Based on BHPS data22
Individuals within low income households	0.0653	Based on BHPS data22
Visual field based glaucoma staging5	Mean defect score (dB)
Mild glaucoma	−0·01 to −6·00 dB
Moderate glaucoma	−6·01 to −12·00 dB
Severe glaucoma	−12·01 to −20·00 dB
Visual impairment (partial sight/blind)	−20·01 dB or worse

GSM: Glaucoma Screening Model; BHPS: British Household Panel Survey.

^aVisual field based glaucoma staging.