Table 2.

A Modified McDonald-Shadduck Scale

Type	Score	Observation
Conjunctival discharge	0	No discharge or may include a small amount of clear mucoid material normally found in the medial canthus of animal
	0.5	Very small amount of discharge present on the globe
	1	Discharge is present on the globe of the eye or medial canthus in a significant amount
	2	Discharge is abundant and has collected on the lids and hairs of the eyelids
	3	Discharge has been flowing over the eyelids in significant amounts
Chemosis (conjunctival swelling)	0	Normal, no swelling observed
	0.5	Mild swelling of the palpebral tissues or very slight swelling of scleral conjunctiva
	1	Swelling above normal, but without eversion of the lids
	2	Swelling with misalignment of the normal approximation of the lower and upper eyelids
	3	Swelling is definite, with partial eversion of the upper and lower eyelids essentially equivalent
	4	Eversion of the upper eyelid is pronounced with less eversion of the lower eyelid
Conjunctival Injection (hyperemia)	0	Normal in appearance for the species, while it may appear blanched to tan or reddish pink, with vessels defined and easily observable mainly at the 12 and 6 o'clock positions
	0.5	Some vessels primarily on upper and lower regions of the globe are more pronounced with more vessels than usual visible
	1	Flushed reddish color predominantly on the palpebral conjunctiva with some perilimbal injection primarily on the upper and lower regions of the globe. More vessels are clearly visible with some engorged and diffuse looking, including connecting vessels not normally observed
	2	Palpebral conjunctiva appears bright red with accompanying perilimbal injection covering at least 75% of the perilimbal circumference, while upper and/or lower muscles appear reddish and irritated
	3	Both bulbar and palpebral conjunctiva exhibit a dark, beefy-red color with pronounced perilimbal injection with petechia often present
Cornea	0	No haze observed
	0.5	Slight loss of transparency mainly visible with illuminated scope
	1	Some loss of transparency with cloudiness readily apparent, but underlying structures visible, perhaps some loss of detail
	2	More loss of transparency, the affected cornea is homogeneously white in appearance
	3	Loss of transparency, underlying structures are just barely visible
	4	Underlying structures cannot be seen
Anterior chamber	0	Totally clear
	0.5	Trace Fibrin
	1	Little fibrin
	2	Moderate fibrin present
	3	Aspects of posterior chamber faintly visible
	4	Totally opacified by fibrin
Vitreous and posterior chamber	0	The view through the vitreous is completely clear and all the details of the retina and retinal blood vessels are readily apparent
	1	The view shows a slight degree of uveitis with a small fuzziness of the details of the rabbit retina, but the vessels and optic nerve head are readily seen
	2	The view shows moderate degree of inflammation where details regarding the optic nerve head and the vessels are still apparent, but are very difficult to appreciate
	3	The view shows a severe inflammation of the vitreous with only the optic nerve apparent and details of the retinal vessels being lost
	4	The view shows the inflammation is so severe where the vitreous is so cloudy that no details of the retinal vasculature or optic nerve head are visible
Synechia	+	Present
	−	Absent
Hypopyon	+	Present
	±	Trace
	−	Absent