|
Toxocara canis
|
Intraocular
|
≤ 400 μm × 15-21 μm
|
Smallest of the nematode larvae encountered in the eye
|
ML
|
|
Baylisascaris spp.
|
Intraocular
|
1-2 mm × 50-60 μm
|
Relatively small but easily recognized as being larger than Toxocara larvae
|
ML
|
|
Gnathostoma spp.
|
Intraocular
|
1-5 mm × 200-600 μm
|
Much more robust than other nematode larva; presence of cuticular spines and head bulb distinctive
|
ML
|
|
Angiostrongylus spp.
|
Intraocular
|
≤1-2 cm × 200-300 μm
|
One of the larger, more robust worms found in intraocular location
|
L, SA
|
|
Thelazia callipaeda
|
Eye socket
|
5-20 mm × 250-800 μm
|
Distinct morphologic features; free in orbit
|
A, L
|
|
Philophthalmus
|
Intraocular
|
2-3 mm × 600-800 μm
|
Ovoid to oblong, flat, solid body
|
ML, SA
|
|
Spargana
|
Intraocular or eyelid
|
5-20 mm × 1-2 mm
|
Long, flat solid body with pseudosegmentation
|
ML
|
|
Coenurus
|
Intraocular
|
< 1 cm
|
Fluid filled cyst ovoid in shape and of variable size
|
L
|
|
Dirofilaria tenuis/Dirofilaria repens
|
Conjunctiva
|
2-15 cm × 150-400 μm
|
Males smaller than females; most often closely associated with conjunctiva; worms in the eye are appreciably smaller than those on conjunctiva
|
L
|
|
Dirofilaria immitis
|
Intraocular
|
1-1.65 cm × 160-400 μm
|
Not a common location for this worm and very few confirmed cases exist
|
L
|
| |
Conjunctiva
|
10 cm × 300 μm
| |
SA
|
|
Onchocerca spp.
|
Intraocular
|
3-5 cm × 80-100 μm
| |
L
|
| |
Conjunctiva
|
total length unknown but several cm or more × 150-250 μm
| |
L, SA
|
|
Acanthocheilonema spp.
|
Intraocular
|
1.6 - 2.1 cm × <100 μm
|
Accurate identification to species has been
|
L, SA
|
| |
Conjunctiva
|
3.2 cm × <150 μm
| | |
