Ophthalmology Media & Reels

The main orbitotomy approaches are categorized by the anatomical direction of entry:

1. Anterior Orbitotomy
Best for lesions located in the front two-thirds of the orbit (anterior to the equator of the globe).
Upper Eyelid Crease (or Sub-brow): Used to access the superior and upper-lateral spaces, commonly for lacrimal gland biopsies or superficial dermoid cysts.
Transconjunctival: Provides access via the inner lining (conjunctiva) of the eyelid. It leaves no visible skin scar.
Transcaruncular: Utilizes the small pink tissue at the inner corner of the eye to reach the medial (inner) wall and is often used for abscess drainage.

2. Lateral OrbitotomyThe most classic and versatile approach, used for lesions located laterally (outer) or centrally behind the eyeball within the muscle cone.
Swinging Eyelid Approach: Combines a lateral canthotomy (cut at the outer corner of the eye) with a transconjunctival incision.
Bone Removal: To access deeper tumors (retrobulbar space), the surgeon removes a "window" of the lateral orbital rim. The bone is then reconstructed with titanium plates at the end of the procedure.

3. Medial OrbitotomyDesigned for lesions situated between the eyeball and the nose, such as deep medial masses or optic nerve lesions.Approaches can involve a skin crease incision near the nose (fronto-ethmoid) or the transcaruncular technique to avoid external scarring.

4. Endoscopic ApproachesEndoscopic Endonasal: A minimally invasive, scar-free approach performed through the nasal passages. It is highly favored for medial orbital wall decompressions (e.g., in Graves' disease) and specific tumors or abscesses of the medial or inferior walls.

5. Transcranial / Orbitocranial ApproachesUsed when lesions are located at the very back of the eye socket (orbital apex), the optic canal, or involve both the orbit and the brain.

In strabismus, an abnormal head posture (AHP) or ocular torticollis is subconsciously adopted to minimize eye misalignment, eliminate double vision (diplopia), or maintain binocular single vision. The fundamental rule governing these movements is that the face or head turns in the direction of the limited eye movement, effectively placing the eyes into a gaze position where the weak muscle does not have to work.

Horizontal Strabismus (Face Turn)
Horizontal deviations cause a rotation around the vertical axis, resulting in a distinct face turn to the right or to the left.
Sixth Nerve Palsy (Lateral Re**us Weakness):
Mechanism: The affected eye cannot move outward (abduct).
Postures: A face turn toward the side of the paretic muscle. For example, a left 6th nerve palsy causes a face turn to the left, which shifts the eyes into a safer right gaze.

Duane Retraction Syndrome (Type 1):
Mechanism: Severe limitation of abduction in the affected eye.
Postures: A face turn toward the affected eye to maintain straight binocular vision in opposite gaze.

Congenital or Infantile Esotropia:
Mechanism: Inward crossing of the eyes.
Postures: A face turn toward the fixating eye if cross-fixation is absent, or alternating face turns if they alternate fixating eyes.

Vertical Strabismus (Chin Up / Down)Vertical deviations involve rotation around the horizontal axis, making the patient elevate or depress their chin to avoid using weak vertical muscles.

Bilateral Superior Oblique Palsy:
Mechanism: Weakness in downward tracking and intorsion in both eyes.
Postures: A signature chin-down posture. This redirects the eyes into upward gaze where the deviation is smallest.

A-Pattern and V-Pattern Strabismus:
Mechanism: Horizontal deviations that widen or narrow in upgaze versus downgaze.
Postures: A chin-up position is used if the eyes align better in downgaze, while a chin-down position is preferred if the eyes align better in upgaze.

Double Elevator Palsy:
Mechanism: Inability of one eye to look upward.
Postures: A chin-up position to shift the target downward, avoiding the need for upgaze.

Cyclovertical Strabismus (Head Tilt)Torsional and complex vertical misalignments force a head tilt toward the right or left shoulder to compensate for vertical and torsional double vision.

Unilateral Fourth Nerve Palsy (Superior Oblique Palsy):
Mechanism: Weakness of the superior oblique muscle causes hypertropia (upward drift) and excyclotorsion (outward twisting).
Postures: A head tilt toward the opposite (contralateral) shoulder, often combined with a face turn away from the affected side and a mild chin-down posture. For example, a right 4th nerve palsy triggers a left head tilt to stop the paretic eye from twisting and causing double vision.

Brown Syndrome (Superior Oblique Tendon Sheath Syndrome):
Mechanism: Mechanical restriction preventing the eye from moving up and inward.
Postures: An ipsilateral head tilt (toward the same side) combined with a chin-up position to avoid the upper-nasal gaze restriction.

Dissociated Vertical Deviation (DVD):
Mechanism: Intermittent upward drifting and outward twisting of one eye.
Postures: A variable head tilt that can present toward either the side of the higher eye or the opposite shoulder to assist with control.

Brown syndrome is a mechanical, restrictive eye movement disorder caused by a tight or obstructed superior oblique tendon-trochlea complex, whereas inferior oblique palsy is a rare, paretic (weakness-based) weakness of the inferior oblique muscle. Both conditions present with a classic hallmark: a severe limitation of eye elevation when the eye is turned inward toward the nose (adduction).

Duane Retraction Syndrome (DRS) and 6th nerve palsy are distinct eye motility disorders that both cause limited outward eye movement (abduction deficit), but they stem from completely different neurological mechanisms. While Duane syndrome is a congenital structural "miswiring" where the 3rd cranial nerve erroneously controls the lateral re**us muscle, a 6th nerve palsy is a functional weakness or paralysis of the abducens nerve that can be congenital or acquired due to trauma, tumors, or vascular issues.

Congenital cataracts require urgent, highly time-sensitive management to prevent permanent vision loss (amblyopia).
Surgical Techniques by Age
Under Age 5: Surgeons perform a lensectomy or lens aspiration along with a primary posterior capsulotomy and anterior vitrectomy. Because young children have highly reactive eyes, the posterior capsule must be opened to prevent rapid visual axis opacification (PCO).

Ages 5–8: A posterior capsulotomy is still frequently required, but a full vitrectomy may be skipped if the surgeon opts to trap the lens optic behind the posterior capsule.

Over Age 8: Surgeons can generally leave the posterior capsule intact unless complications are present, as older children may cooperate for office-based laser (Nd:YAG) procedures later on.

Dumbbell Dermoids:
A rare subtype where a bony defect allows the cyst to have both an anterior (superficial) lobe and a posterior (deep) lobe, which are connected by a narrow "waist" through a hole in the orbital bone.

Epithelial downgrowth is a rare complication of intraocular surgery or trauma characterized by invasion of surface epithelial cells into the anterior chamber (AC) of the eye.
The membranous spread of these conjunctival or corneal epithelial cells can be difficult to control and lead to devastating consequences including end-stage glaucoma and permanent vision loss. Fibrous downgrowth is a similar but somewhat less aggressive condition characterized by fibrovascular connective tissue invading into the eye.

𝗔𝘀𝘁𝗶𝗴𝗺𝗮𝘁𝗶𝘀𝗺 & 𝗰𝗮𝘁𝗮𝗿𝗮𝗰𝘁 𝗶𝗻𝗰𝗶𝘀𝗶𝗼𝗻𝘀

Astigmatism correction follows corneal biomechanics—not random decisions.

Incisions flatten the meridian where they’re placed → reducing astigmatism.

👉 Temporal → minimal SIA
👉 On-axis → low
👉 Arcuate/paired → moderate
👉 Toric IOL → high

🧠 Cut the steep → flatten

Post-trabeculectomy complications
👉 IOP + AC depth = quick diagnosis

🔵 Low IOP + shallow AC + elevated bleb → Overfiltration
🟡 Low IOP + Shallow AC+ absent bleb elevation → Effusion / leak
🟢 High IOP + Deep AC → Failure
🔴 High IOP + Shallow AC = 🚩

(Malignant glaucoma, pupillary block, SCH

How Glaucoma Affects the Optic Nerve

Cupping: As nerve fibers die off in glaucoma, the central "cup" physically enlarges and deepens, a process called cupping.

Notching: Loss of neural tissue frequently occurs at the top (superior) and bottom (inferior) poles of the optic disc, often referred to as "notching".

Vessel Changes: Blood vessels may shift, bend, or appear kinked as they traverse the thinned or excavated rim.